The proof of Holloway as a manager & whether this is a fluke, would come if he could either sort their defence out next season, repeat the same thing at another club or get Blackpool promoted again playing the same way when they're eventually relegated.
I'd hold my hands up if he did any of those things but I recon he'll fail on all counts. Well done to him & the players for what they've done though. Great entertainment & some genuine quality football. Makes you wonder what top managers could achieve if they built their teams to concentrate attacking 1st rather than defending. They would be sacked before it clicked though unfortunately.