I am aware of the weaknesses of Cloud's ground game, but I find his air-to-ground game strong enough to very clearly make up for it. You don't always have to autocancel Nair, honestly. It has 15f of landing lag, which is 1 more frame than Ike's, and it covers distance almost equal to it. It's very strong in this regard.
I also don't believe he loses to or beats Bowser that badly. Yes if he messes up he dies, but if Bowser is hit upwards he is not touching the ground until he has received enough damage to die to a Limit move, Cloud's movement speed and juggle game make this easy to accomplish.
The minute Cloud hits Limit is when his neutral game improves significantly, btw. He stops having to camp because his jump height becomes stupidly low and his autocancels remain. This TIGHTENS his already amazing air to ground game and ADDITIONALLY it gives him the mobility to whiff punish legitimately anything. While I agree his ground game is only "suitable" and not amazing, his air game transitions into it very smoothly, and moves like Dtilt and Dash Attack are very solid in their own right.
My PSA is: Don't be afraid to incur landing lag with Cloud's aerials, for the most part (outside of Dair) it's not that bad, really. And remember, when in Limit mode, dance around your prey because you can capitalize off of a single opening and it is BEAUTIFUL.
Oh also
Big-Cat
while I wouldn't say Bowser is high tier, I think he's close. You have to apply legitimate counterplay and learn the matchup now, so prey on the people who don't = ). Even when they have learned the matchup, I believe Bowser's strengths are solid enough to win, don't get me wrong, but people are dropping to him because they underrate just what a great throw game does for him. He now has a combo throw kill setup and two different kill throws that start working around when the U-Throw > Uair combo ends up missing, this is fantastic for him. Charcter couldn't have asked for anything more, people didn't take Bowser seriously for the longest time so now they have to, it's pretty great.