Interesting to read the differing views on Pan which seem to support my view that he is very difficult to value. At his best he can be a very dominant force in a L1 midfield - always winning the ball, constantly working from side to side and from box to box. Even on these good days, however, the obvious weaknesses are there - the final ball, the wild finishing, and the lack of aerial dominance given that he has height. On a bad day he can be pretty poor, cumbersome, and appearing to lack a good football brain. His value is enhanced in the view of many fans by his popularity - he plays with a smile on his face, works hard, and gives every impression that he loves the club. There's also constant talk of his potential, more so than for the average 25yo footballer, but he is a late developer and said potential is certainly there. However there is absolutely no guarantee that he will fulfil it.
If you are valuing a house, it's pretty easy if the identical property next door has just sold for £xk. It is less easy if there is no comparable house, with the valuer having to speculate how much someone would be prepared to pay for a unique property. In footballer terms Pan is very much in the second category. If he moved to a Championship Club he might quickly be star, or he might struggle with the step up. Whilst the last statement is true of most players, the extremities are wider with a player like Pan. How much will someone be prepared to pay, with a year left on his contract? I haven't a clue, and I don't think many others have either.