I think if Jose likes one of the front four to do defensive work as well, that would favour Moura or Lamela.
I'm not saying Dele can't do a defensive shift BUT those two are like rabid animals.
i think it's all down to what clicks and what doesn't - the current front four click, despite previously it not being given much consideration a player like Moura (or Dele) would work in that area.
it's also interesting the perception people have of one player v another, Moura in 90 minutes v Palace, 5 tackles 3 interceptions, Dele in 65 minutes v Fulham 4 tackles, 2 interceptions - so clearly both putting in the same sort of defensive contribution as one another yet the impression seems to be that one is going to give you more off the ball than the other