Antony signing for Real Betis is one of their best signing their summer he was very instrumental for them during his loan time and now that he's back as a full player his presence should add more force to their attack just like he did last season. Antony performance for Betis was far better than what we saw him do in Manchester United and this season Real Betis should finish in top4 probably ahead of ATM they is in poor form.
Surely something must have motivated him to go to Real Betis. Sometimes there are factors we don't know about in the decisions of players and coaches. For example, Mourinho refused to go, despite being overpaid, to play in the Arab League. Maybe his wife doesn't like the climate or something else in that part of the world.