We cannot tell who fits better until we see Manuel start playing with the SMB. However, in comparison, Arwind Santos has helped a lot the SMB team to be successful because he won championships many times with this team. Maybe let's just say that his time has come, accept his fate and probably also prepare for retirement soon as that's life in basketball.
Right now, SMB is still figuring out how to be more competitive to be a dominant team again.
Arwin knew that and he can't do anything it's the franchise decision, better to accept this fate and continue receiving paychecks, and it's true he can start thinking about retiring, he already contribute enough to this league, with those rings it's a good achievement that every players desire to have when stepping to this league.
Santos also is a very accomplished player, he won multiple championships and finals MVP as well.
There's nothing to worry on his side as he will continue to receive his salary and eventually he will retire since he is already in retirement age.
SMB thanked him for his contribution as he did his job very well, but since this is business and time will come the management needs to make a decision for the betterment of the team, he just have to accept it's part of the process.
I'm curious though to what contribution both Manuel and Enciso will add to SMB. Not sure but both players came from alaska right? they are familiar with each other, the adjustment with SMB system is very crucial if both of them are fits to what SMB runs a play.
I understand that the SMB management already have a plan prior to the trade, so there's nothing to worry about, they can test them and if they don't work they can find a way to trade them too.