Here's the thing, nobody (at least not me or anyone who I think is making the same case as me) is saying Bowers isn't gonna be a top-3 TE. Its just that he is riskier than McBride and Kittle because of a new HC, OC, and QB. There is a huge dropoff after the top-3, and personally, I think getting 1 of them is priority #1 in drafts, and in auctions, I'd prefer whichever is cheapest, which seems unlikely to be Bowers, as he's the hot new thing.
Its also debatable if Bowers has as much upside as the other 2 guys. Personally, I think he's more talented than McBride, but Arizona is a likely better offense than Vegas. I think Kittle is more talented than either (I'd argue Kittle is the 2nd best TE of the last 15 years, he just wasn't targeted like Kelce was) and his plate looks ready to be fuller than ever, in addition to SF having a better offense than either team.
Again, I don't think anyone is saying they are worried about Bowers, or that Bowers will be a bust, or that Bowers isn't going to be a good pick. Its that McBride and Kittle are arguably better ones, that could have both higher floors and ceilings and come cheaper. Doesn't make Bowers a bad pick, just might make them better ones.