Felix was impressive in the beginning too. Don't think he'd do any worse at Brighton than Ansu has.Compared to Felix, Ansu has been impressive though. Buying Felix for 70 - 80M and selling Ansu would be a mistake in my eyes. But its still early in the season we’ll have to see how everything evolves.
But I don't think we should sign Felix, it'll be another summer at Atleti where they demand way more than he's worth. Only way I see it if Mendes begs Laporta to splash the cash on him.
Back to Ansu. You could say Felix also lacks strenght and pace, but there's a difference in how they try things. Ansu looks like he's in jog mode, he doesn't fight his way through situations. The turns Felix tried against Shakhtar would probably break Ansu's body, he seems so stiff.