The Ange-in answer (which I don't agree is sufficient) is (1) injuries (2) momentum / squad backing with EL win (3) Ange made a decision to de-prioritise league. Idea is if you put all this together it amounts to a good chance of a better league performance and a decent crack at the cups next season.
Based on this season, and Ange having to totally forego the league games in order to beat AZ, Frankfurt, Bodo, and Man Utd, then it feels as though there is no chance at all of this happening.
Season before we did well in the league, had no Europe, out of League Cup first round, out of FA cup second round.
So for next season, based on the evidence so far, are we happy to once again go out of the cups early doors and have a passable league season (with no guarantee of that being actually fighting at the very top end), or sacrifice the league again to have a shot at the cups, with the risk that another similarly poor performance coupled with better fight from the sides coming up results in a real relegation battle?
To me this whole notion of being crap in the league enabling the cup runs is bizarre, this was a freak season, usually the sides that are scrapping it out for the cups are the better sides in the league(s), or at least competent. 3 of the 4 sides in the semis of the domestic cups qualified for CL via the league this year, the 4th being Palace, who after a dismal start were pretty decent this season.
Going as far as we did in Europa would excuse a dip in the league by a handful or places, dropping out of the top 10 should have been out of the question, dropping down to the worst team not to be relegated is absurd and inexcusable.