#7 Ganso
Ganso was in the Santos side at the same time as Neymar back in 2008. Neymar was undoubtedly the better of the two, but Ganso looked as if he had a huge amount of potential as a midfielder and could have possibly followed Neymar to Barcelona, given the form he was in at that time.
However, his consistency dwindled over time and instead of a big-money move to Europe, Ganso switched to another Brazilian side, Sao Paolo for £8m in 2012. He remained with the club for four whole years before eventually heading to La Liga, but it wasn't with Barcelona like his former teammate; instead, it was mid-table side Sevilla.
Ganso was pretty lacklustre on the whole, which led to his loan move to Ligue 1 side AC Amiens in the summer of 2018. He returned in January of this year somehow even worse than before.
Ganso would be shipped out to Fluminense on a free transfer a day after he returned to Sevilla from his loan, perhaps signalling the end of his time in any top flight football in Europe.
What could have been...