Agree with you JV on the range of reasons he may be coming here.
The link below suggests Poyet is not big on youth development and you get the feeling was never going to push a kid into a key position when he knows they will at best be fighting to stay in Prems again next year. It may be as simple as that. The link - quoted below - also has some more insights into Gorrin's work-on areas and where he is at with his development.
For me, it's wait and see, but there are enough hints about this kid to suggest he may be a very very good signing for us, so long as he can handle the physicality and hit and miss player protection from A-League referees. And, for my money, he certainly plays in the right position and has exactly the right sort of versatility to be a good addition to the squad. Whether he becomes a star or at very least quality import level A-League player will be interesting to see, but you'd have to rate him as a good chance. Assuming he's a significant step up from Lia and can cover Riera's role, that's good enough for me and, if so, all we need now is the guys up front to collectively find 35-40+ goals. And Sig and Dura to find another yard of pace during the off-season lols.
Gorrin has 4 goals and 2 assists in 25 games of playing minutes, not that you expect it will be his primary role for 'Nix, but a goal every six games or so would be useful. As far as I can deduce, that is possibly from playing in a bit deeper midfield role much of the time.
Touch wood he works out really well and improves with age.
http://www.a-love-supreme.com/Reserves%202010-11/chelsea%20away.htm
"Poyet doesn't have the best record of bringing through young players, however, with quite a few players out of contract in the summer, it could bring about a fire sale in January. This, as well as the congested fixture list, could mean we might see a few of the younger players brought on to the bench, maybe even the starting eleven. David Vaughan, Sebastian Larsson and Craig Gardner (thank god) are an example of three of the players who could be sold in January, meaning that we would be light in terms of centre midfielders. Alejandro Gorrin immediately springs to mind considering Poyet's brand of football, as the Spanish midfielder can happily run a midfield and has improved his game in the last year, getting more involved with the play and bulking up, where perhaps last season he was too easily pushed off the ball and could go hiding in games. Today, he played in a slightly advanced role, playing off the hapless Connor Wickham to accommodate Cabral playing in the middle."