That is more of Wehr advantage as ketten post upgrade gives raw +3 on points.
I used to open with bike, but its not worth it most of the time unless you're one of the god micro players.
PG into 250 into PG is much more versatile and aggressive opening then what you've described, it might be just my imagination, but it is very noticable that DAK infantry really does perform a lot better with vehicle around.
Having use them and having them used against me, I'll just say this:
Don't fucking blob like it was coh2.
It's not about blobbing, but an anti-tank loiter WILL destroy your tank without any effort and there is nothing you can do about it. Medium tanks simply melt away. That has nothing to do with blobbing I think...