Wow, bud, you're assuming quite a bit there, starting with us moving to 4-3-3 as our new base formation. I mean, I think we should be able to vary our tactics a bit more, but that's a big shift that hasn't been confirmed. Also, IMO, Nani is not nearly the caliber of player Higuain is, I don't think he could make nearly the difference for our club that Higgy could. Honestly, I'm not interested in that player at this point, not really a Nani fan.
The bottom line, Baggio, is that we need 2-3 new attackers for our forward line to be up to snuff on the continent. Llorente is not somebody that I rate particularly highly (I've gone over this before, I've seen him in limited action - 7 games or so, never found him impressive), he's sat out most of a year, new club/language/country, etc. That move is not a slam dunk, I don't simply pencil him in, and say that because Athletic wanted 36M for him or whatever, he's going to save the day - or be prolific (something that he's never been in La Liga, anyway - 18 goal max season).
So, depending on Marotta's available options, the situation with Higuain, etc., I would gladly welcome a player of his ability to my club. It might not be the ideal complimentary piece, but his goalscoring certainly does meet a serious need.
I'm not somebody who believes in widespread changes (in this case, I don't think we should clear out our entire attack), but if opportunities arise, we should seize them, and then work towards selling the strikers who are not as gifted. Still lots of time in this market.