Yeah, Middleton's comeback is good news for the Bucks, although it's worth noting that they're performing pretty well even without him, given that they're currently in 2nd place in the Eastern Conference. As for the upcoming game against the Lakers, it should probably be an easy win for the Bucks. Nevertheless, I would prefer to see the Lakers win because by doing so, the Lakers would prove that they aren't a hopeless team and can still beat tough opponents.
Bucks needs to Middleton as another reliable scorer aside from Giannis. This is the main reason why Bucks defeated by Celtics because Bucks is so weak on games that Giannis cant perform well. Bucks is highly dependent to Giannis and has a very inconsistent outside shooters. With Middleton come back, They can solve already there weakness that lacks of good and consistent play maker for Giannis to get a space that he needs to dominate the game.
They might look really strong on there current record but this is useless on play offs especially when they are against Boston that became more solid than ever. They cant beat a same strong team for multiple match in a row if there play only revolves to Giannis.