I believe that Joao Felix has the potential to develop into a Aguero like level.. remember that Aguero was mostly a 2nd striker as well earlier in his career at Atletico (I basically watched all his games there). If you look at his traits he has good anticipation and heading(leap) ability in the box that he can develop further combined with all his other attributes of course. In this video you can clearly see his "fox in the box"* like qualities as well. (*he hasn't showed that much at Atleti though..)
He has a physicality and ability to build that unlike many players in his mold as well, well prepared for the PL style.
+I believe he needs a change of scenery away from Atleti and Simeone and could probably be had for price around slightly under what he went for there. +90m£
I don't believe Pep will ever go for a player of Lukakus or Hålands ilk and technical level I'm sorry.. remember, he barely went for 'big man' Ibra and he's got fantastic technique.
I believe it will be him(Felix) or Kane.. if they can get a good deal for him at 120m as rumoured.