I think if Go-Busters was always intended to have multiple villain groups, then Messiah wouldn't have made it to episode 20. My current theory is that Enter will now be the big bad, with Escape as his right-hand (wo)man, and one of their primary motivations will be how the Busters killed their master.
Regardless of whether it's purely down to the retool, it's good to have a 'big' episode at this point. So often at this point I'm basically just waiting for the last ten episodes so the plot restarts again. But no, cool fight action from Enter, the first time in forever we've seen the 'basic form' Megazords, and a real sense of anticipation. I would have liked a bit more from Jin on what was going on, as his "I know something you don't know" part at the beginning was basically all he got to do the entire episode, but that's just nitpicking.
Zut! Zut! Zut alors!