I read that Kupp's preference is Denver.
My belief is that Kupp is the primary reason that Puca Nacua was able to walk into the NFL and be as good as he is. That's basically unheard of these days for any WR, let alone a slot that has so many decisions as the route unfolds. Then add the positioning and body control.... Kupp isn't worth 12mill per, but if he can raise JSN's level of play like (I believe) he raised Nacua's, he's worth more than face value and probably 10+/- ...in my opinion.
Also, I hope JSN can be more than a carbon copy of Kupp. There should be opportunities for JSN to play wideout with Kupp in the slot depending on who else winds up as X (probably from the draft, maybe MVS?).