Uh, can I just mention that Incineroar would be plenty unique. I happened to notice through catching up that a few comments seemed to imply he wouldn't be.
It's not always just what you do in Smash (punch, kick, use a sword) it's how you do it. Either people don't understand what a grappler is in a fighting game, or they think being an archer on its own is more unique than an entire playstyle. This is coming from somebody who loves the idea of Decidueye.
However, Decidueye wouldn't be an archer for every single attack. This is just as Incineroar wouldn't just punch and kick, or necessarily grab for every attack. Given the fact that Incineroar is a wrestler already, the two best comparable characters I can think of are Zangief from Street Fighter or King from Tekken. Each has punch and kick combos, but most of the damage done comes from a variety of grabs.
This type of moveset typically leads to the character being slower, but also having some super armor attached to certain attacks. This seems like something we'd see from Bowser or Donkey Kong. K.Rool seems to have a pretty nasty Up Throw as well, dealing nearly 17% damage in one use!
Imagine Incineroar as a character who, after a combo that sends a character into the air, can do some sort of aerial grab, whether it's instead of an aerial kick or attack. To actually perform the grabs, Incineroar would need to get in close to his opponent. This would mean he'd need to find a way to mitigate projectiles, and get in close. His opponent, likewise, would need to try and keep their distance from Incineroar as getting in close would be...painful.
The thing that would mostly make Incineroar different from other heavy character would be that he'd have more throw setups. Bowser has his normal throws, and then the bodyslam side special. Donkey Kong has his multitude of throws. Ganondorf has his side b as well. The thing is here, that the only one that really serves effectively for combos is DK's throws. For example, a grab, pick up and run with the opponent, jump, up throw, uair. This is one example of a grappler in Smash.
I think it'd be neat if Incineroar had options in executing grabs in different aspects of his moveset. For example, a punch/kick combo side b like Marth that ends with a body slam. A counter that, instead of a strike, is a grab. Perhaps he could have some sort of "stance change" or powerup where he takes less hitstun, which allows him to move in more easily.
Whatever the case, Incineroar has a lot to work with. I think he'd be a fantastic, unique choice.