I'm not crying incompetence, but there has very obviously been a very public game of brinkmanship going on with this transfer. If this whole saga ends with another club buying Dibling for the deal Southampton wanted while Everton end up with nothing, then Everton very clearly haven't won that game, have they?
I'm not convinced Spurs do end up with him FWIW, but their very involvement makes it a lot harder for Everton to gain any ground in negotiations. The best run at it they had was two weeks ago when nobody else was interested, but for whatever reason nothing happened then.
Also I'd be more inclined to give Everton the benefit of the doubt if this exact thing didn't happen almost every summer, always leaving us empty handed.