This is getting so complicated, I'll try to summarise, but I'm starting to get confused:
UEFA Cup places:
5th in league
League Cup winners (Spurs)
FA Cup winners
If Portsmouth win the FA Cup, & finish 5th, the cup runners-up get the UEFA Cup place. Wikipedia is right - the only scenario where 6th gets the spot is if both cup finalists were in the top 5 in the league, which is impossible this season.
Hopefully that's right!