I feel Mourinho has found a target men in Lukaku and Fellaini. Fellaini leaving means we need a replacement (this doesn't discount the replacement needed for Carrick), so a target man like Talisca will be a perfect replacement.
Talisca is Fellaini with an extra three infinity stones in skill, agility and shooting prowess. I feel he is a decent replacement for an option 2, when things are not working out. Mourinho would have used Fellaini if he could for the final, but couldn't as he was injured. Talisca is that upgraded Fellaini, to put it bluntly. Let's be honest, we like Fellaini's physicality-but he lets himself down with the lack of technical ability and agility.
Again, we 20 goals and 8 assists are not easy to achieve for an inconsistent player who doesn't work hard for the team. I have my doubts because Mourinho's signings haven't been great.
I hope Javier Ribalta is the one behind this and brought a good report back to Mourinho (who he already knows of course) because he really does have an eye for untapped talent.