Regarding Alexis, I ended up keeping him, to ensure a good result in the first season. Money is borderline unlimited with the 300m warchest, and until you secure champions league, it's hard to attract players of equal skill level.
I'm very fond of the young offensive guys you start with. I gave Nelson lots of game time in the first season, and he developed immensely, result is he secured the Golden Boy award in 2018.