Sure and the Stryker brigade with a battalion of MGS in open terrain would thump a Russian MRB equipped with legacy equipment.
See, that's what I thought too...
10 to 1 was just something I said to indicate how much better the wheeled MGS unit can concentrate. That you are dwelling on it indicates a fundamental lack of understanding in mechanised warfare. One Stryker brigade with enough room to move vs one MRB with legacy Soviet/Russian equipment will result in a win to the Strykers.
Under the current focus of the Stryker BCT for medium intensity COIN they are for infantry support but trained for mechanised manoeuvre operations the MGS becomes the centrepiece of the combat team.
So essentially they fill the exact same role as MBTs do in the legacy MRBde set up. Ok, this makes more sense.
What I do know seems to imply that Stryker MGS are organic to a rifle-company rather then a separate unit. Does this mean they would detach for the purposes of playing as a maneuver element and form a composite unit, or would an entire rifle company be the maneuver element? In which case they would only have 3 actual MGS to act in the anti-armor role...
I've found FM3-21.31 on the Stryker BCT, but don't have time to read the whole thing right now, so I'll look at it tomorrow.
Some assumptions you seem to have generated need to be jettisoned.
1. That Stryker MGS type vehicles need to have 10:1 advantage to win.
2. That Stryker MGS type vehicles have to retreat to win.
It appears I misunderstood what you said. Those weren't assumptions, I actually found it rather incredible that you appeared to be saying those things.
What I meant was that the faster speed of movement of the Stryker and similar enables them to concentrate to overwhelm older main battle tanks. For example a lead tank company of an advancing legacy tank battalion would be hit by an entire battalion of MGS type vehicles resulting in destruction of the tank company. And if for example an MGS type company was to run into an advancing battalion this company could just fall back before being engaged and concentrate with the rest of its brigade to destroy the advancing battalion.
Would this work similarly against modern MBTs, just less effectively, or would the Strykers behave differently? Also, against legacy tanks it's not unfair to assume that the Strykers will see them first, and using speed, have contempt of engagement. But against more modern MBTs will this still be the case?
Finally I'm not sure I agree with your assumption that the tanks will be moving without a recon screen in front. While this is the case far too often with Russia, it stems from poor planning and training (especially on the higher officer level) rather them doctrine or concept of employment. If the Strykers encounter a recon screen, riding similar light vehicles (BTR-80/82 recon variants, or a western equivalent), they won't be able to know whether enemy tanks are behind them, or mech-infantry, or nothing at all. Would the engage the recon screen? Fall back?
Also the Stryker MGS' themselves, will they be on point in the brigade, in an advance?
In one US experiment a brigade of RDF/LT (13.2 tonne vehicle armed with a rapid fire 75mm gun) supported by a battalion of Chinook helicopters was able to comfortable defeat an entire GSFG tank division (T-64s) in south western Germany terrain because of the rapid mobility of the RDF/LTs lifted by helicopters.
Sure, but with vertical insertion you can also negate terrain features like rivers, buildings, etc. and of course the helos can provide recon capability. I'm also assuming the experiment ignored division AA assets, to allow those Chinooks to fly around freely (or were they dodging around the engagement envelopes of the SA-6s and SA-8s?). So while the experiment is very interesting, and does showcase the significance of mobility vs protection, it has limitations when considered here.
Another question, would this work similarly if we were talking about a tracked medium or light SP gun system? Sprut-SD comes to mind as the most relevant real world example, but the BMP-3 and BMD-4 both provide capabilities that aren't far off (with the 100mm main guns+30mm autocannon combinations). I'm not aware of western vehicles of the sort.
If the Kurganets-25 is completed, there will likely be a light tank/self-prop gun of ~125mm caliber on that chassis as well.