No doubt about it, he (Maher) does seem to have plenty of potential and even still room for growth and improvement which he could obtain with time at, like you said, one of 'the giants'. It's not just his skills too, he showed great character always going forward and looking very impetuous on the field.
As for us for both RB and LB positions... i haven't lost hope in Santon, he is still very young and can perform at both positions actually but, as for Abate, he really should go asap. I still prefer Maggio and Cassani over him even if they are both far from world class and not too good defensively. De Sciglio from Milan could be a nice option in the near future (he can also play at LB just as Santon and they are both less than 22 y.o.) and possibly Biraghi. time will tell with these last two. I'm hoping for the team to play with 3 at the back looking forward to next year though