You're kinda conflating the standard "grappler" and "wrestler" archetypes.
The "grappler" archetype in a standard fighting game is a character who is based around throws for his/her standard combos and mobility. In most standard fighting games, throws are a relatively minor part of a characters set, with most characters only having one grab a tool to counter blocks and occasionally start/continue a combo. This is what separates a grappler from the rest of the cast; throws are much, much more important for a grappler, having a variety of grabs that function as the character's main tools for approaching, controlling where their opponents are, and capitalizing on punishes and combos.
"Wrestlers" are a sub-trope of grapplers in Fighting games. These are characters that utilize moves seen in professional wrestling and European wrestling. They often have low mobility, high damage, a large frame, and much more super armour. Not every grappler is a wrestler (Android 16 in DBZ Fighters is a good example) but most wrestlers are generally grapplers.
Whether or not Smash has had a "grappler" before is a pretty difficult argument because how different throws are in Smash relative to other fighting games. Every character in Smash has at least 4 grabs, with at least one of those grabs being a fairly important part of a character's moveset. As such, some people may argue that EVERY character in Smash would qualify as a grappler, as they all have multiple grabs and their grabs are important to best utilizing each character. Likewise, some people would say there's no grapplers, as no characters have an emphasis on throws over their other attacks. As such, I decided not to bring up the grappler aspect of Incineroar as that would require a discussion over the role throws have in Smash relative to other fighters.
What I did argue was Incineroar being a wrestler archetype would not be unique, as Bowser and (to a much lesser extent) King K. Rool already encapsulate a lot of the tropes standard to these types of characters.
