Towing Yoda will not get free galloping attacks. This interaction was discovered within a few weeks of release, back in the day...and almost immediately WotC clarified that the galloping attacks need to be on Yoda's own turn (not when he gets towed on R2's turn).

The squad is currently set as Private, so we cannot see it via the link you provided. (You need to select "Edit Squad" then go down to "Visibility" at the bottom-left of the screen and select "Public.")

Generally speaking, the 33pt Captain Rex is a far better piece than the 41pt version, so I'd suggest making that change.
Quinlan Vos is a fun piece; I played him often, back in the day. His LS Sweep is really nice with Anakin's Momentum (or eventually his own).
The Massiff is a great choice for 10pts, when you have this Anakin.
If you're playing a semi-competitive match (or more), then you might want some door-blower-uppers because you'll be susceptible to lockouts once R2 dies (which is probably soon since he's a high-priority target for your opponent). So with the points you save on changing Rex, you could bring some Ugnaught Demolitionists.

Overall, this is a really cool squad. Remember that Anakin's CE only triggers when a follower "ends its movement"...so Yoda will only get the momentum bonus once that happens. He'll be +18 for 20dmg for his whole gallop, until he stops movement...at that point he'll be +22 for 30dmg against anyone whom he ends his movement beside (so don't attack them until you declare the end of your movement). And if Yoda only moved up to his speed (or a bit more by using Master Speed), he could declare the end of his movement, and gain the Momentum bonus for his gallop attack...then also make his regular attack at +18 for 30dmg. So Yoda can do a pretty reliable 60dmg on a single target from up to 16 squares away (in addition to whoever he smacked as he galloped by them)...that's pretty solid.

I hope you have a great time with it!