The main issue with up throw is that your opponent holding away makes it very difficult, if not impossible, at mid-high percents to follow up, but other than that Bowser can get combos going pretty late as long as he can reach the opponent, the only thing they could do to fix this is either more range on his aerials, faster and/or higher jumps, or by making D.I on the throw much less or removing it entirely. I guess better frame data on aerials could also help, and maybe less end lag on the throw, but it already ends pretty fast, and I don't think Bowser really needs any major aerial buffs to be honest. Maybe something will be done about it eventually, but in the meantime, I think the solution would be to make the most of the throw anyway. We already know that holding away can avoid follow-ups at later percents, so the next step is finding options that punish holding away. By doing so, the opponent willingly gives up stage control, and you can still get a landing trap out of it. Up throwing while facing offstage might be a good idea too, since if they hold away they are helping you set-up an edgeguard and if they hold towards you should still be able to get the Fair or air dodge bait -> Up-air mix-up.
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