Don't think it's fair to label that as arrogance.True but Lampard was arrogant enough to think that he could connect with him and resurrect his career.
Since then he's failed with 2 more clubs.
No he's finished and now everyone knows it
Any manager worth their salt should back themselves to bring the best out of a talent like Alli. The lad is still only 26. It's insane what's happened in his career.
I'd be willing to wager Lampard would have continued to back himself in getting him back to form if he hadn't been constrained by the finances of his deal.