well once ur in WVR theres no advantage of stealth anymore
That's why I assumed that both aircraft have stealth. They can only engage each other when the stealth element is taken away from both, ie in the near BVR or WVR.
Expecting 4th gen planes to take on 5th gen planes in WVR is not a safe assumption because 5th gen planes can take the leasure to engage 4th gen planes at BVR whereas 4th gen planes would have trouble finding 5th gen.
If size is the reason why planes should not focus on maneuverability because they can rely on BVR engagement, then aircrafts like the flankers would have even more reasons to drop the maneuverability requirement compared to stealth planes like the J-20
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Big planes would have their own advantages. I think J-10 won out in this case due to better aerodynamic designs. But if it was a J-10 against a J-10 layout-like twin powerful engined plane the size of flankers, I think I would bet on the latter.