If you look at PG13, PP, and DW as 3rd / 4th options it's nice to have three guys there. And Baylor was left out of the discussion - maybe on purpose - but he has shooting ability across the board and while he probably doesn't emerge as a 3rd option (as a starter) I think he could be in the tier below PP, PG, DW next season. But your analysis does reveal a hole left by Brown that would be great to fill with a trade for Trey Murphy (still dreaming).
(1) Yes, it is still good to have 3 guys who are 3rd-4th options. I think that will carry us well through the regular season. I see not having a true 2nd option (or even high quality 3rd option - scoring wise) as more of an issue come playoff time.
That if teams can limit Tatum or if Tatum has some bad scoring games (as he has done in the playoffs in the past), there is nobody able to step up and provide cover for him. For example, Jaylen did very well in the ECF Finals and Finals which is why he got the MVP award for them. He covered for Tatum.
Now there is no cover for Tatum on those nights. The 3 other guys are good at playing off of Tatum and contributing around 15ppg each but all 3 of them will struggle to up their scoring on those nights when Tatum is contained / playing poorly. They do not have the shot-creation skills.
(2) I forgot Baylor. I would couple him with Hauser. Less shooting but a bit more passing / connectivity play. I would describe Baylor as quite a limited offensive player.
This is because his scoring numbers relative to playing time are quite low. He scored 5.5ppg in 18.6mpg which is 10.9pts per 36min. That is a low rate of scoring. That is the same as Jordan Walsh.
I like Baylor when he takes spot up jump-shots. He is very good at that. He terrifies me whenever he tries to shoot a jump-shot off the dribble. A 3, a midrange 2, any type of jump shot off the dribble - terrifies me. So he is limited. He is only really a spot up shooter like Hauser is.
And relative to Hauser, he isn't as good of a spot up shooter. Hauser has a much quicker shot release and will take some semi-contested 3s. This allows Hauser to get up 6.5 threes in 24.8mpg versus 3.2 threes in 18.6mpg for Baylor. Or 9.4 threes per 36min for Hauser vs 6.1 for Baylor. So Hauser gets up 50% more 3s per minute than Baylor - because of the quick release and ability to take 3s that are more contested. Baylor has to be more open. He has to have more time. And if he doesn't have time - he can't score.