Muscle development from mobility exercises?

With many of the mobility exercises being weighted, would there be a chance of muscle size increases as you progress to heavier weights?

There would be a chance, yes ;-)

Sorry for being a d!(k, couldn't help it :-P

I'm at that age where, if you're not building muscle, you're losing it so muscle building has been on my mind a little more lately. If some of the weighted mobility drills can help with that, I might try to get the most out of it.

Don't get too excited. Mobility work tends to be tough on small muscle groups and connective tissues. Meaning you should only increase weight at a conservative pace.