I looked at eventhubs for Bowser, information on there is really messed up , it lists captain falcon as our worst matchup, not sheik, and also says little mac is a bad mu for us as well
To be fair, a lot of this isn't too messed up. I believe the Falcon MU thread on Smashboards lists Bowser as their best MU. Some ridiculous score like 80:20. And furthermore, there's like three times the amount of Falcon players out there than Bowsers who could object. I think Falcon is absolutely tough. Not Shiek level bad, but tough enough that we're fighting at a disadvantage unless we have our delicious Dash Slash for recovering high and aggressive engagements.
As for Little Mac, I could see it. I play both characters, and I think Little Mac should enjoy the Bowser MU, since Bowser typically has to fight on Mac's terms. Bowser's low mobility makes KO punch extremely difficult to avoid. And he can forget about Jab frame traps. With Mac's frame 1 jab, the only options that will work are frame perfect Dtilt and Ftilt followups. Good luck with that. Jolt haymaker circumvents Fire breath entirely. Dash Slash aggression may be good, but unlike Bowser, Mac does have a frame 1 invincible OoS move. In my opinion, this MU is even for Bowser at best.