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I know from your past posts regarding Dele Alli that you have written him of totally, and I don't altogether disagree with you. In fact I wrote on another site a few months ago, that I felt that he probably needs a change of Club to rediscover his form. That didn't go down well with other fans, but I still stand by that opinion.
However, there are two ways of looking at the Alli situation. The first is that we have seen the best of him in a Spurs shirt and that he should be moved on. Alternate view is that he has proven ability with Spurs albeit not recent, he is still relatively young, and he displayed for a short period when Mourinho came on board, that he still has match winning capabilities. Finally, and I've said this before, I think he has missed his mates, he's a follower not a leader. Unquestionably he's a better player when paired with HK, and that hasn't happened too much in recent times, whilst Eriksen and Poch were also influential in bringing out the best in him.
I do have some belief that Kane, Alli, Son and Lo Celso can be an excellent front four for Spurs, provided that they are all fit, and playing regularly together as a unit. If that doesn't turn out to be the case, it will be time to move him on.