Quite right, leadership can come from anywhere, you're also right about the off field loss from Milner and Hendo. On the Thiago front, I'm actually still expecting him to go, I feel by the end of this window it will be wholesale midfield turnover with Keita, Ox, Milner, Hendo, Thiago and Fabinho all gone and a shiny brand new, younger midfield. My current expectation is Fab and Thiago to also go and two more midfielders to come in but I think one of those two will be a surprise one. Someone we've not been linked with, someone right out of leftfield. I'd like a CB too but I dont feel thats on the list for this transfer window.I'm not sure you specifically need midfielders to do that tbf but it's a job somebody is going to have to take on. The likes of Trent, VVD and Robertson are probably the 3 most likely to step up in that regards. What will be harder to replace is their leadership off the pitch. Henderson and particularly Milner were the standard setters every day in training and I'm less sure VVD or Robertson are the characters who will take on that role. I get the impression both prefer to be one of the lads.
Who knows with this summer but you've got to assume that Thiago will stay now and although not a ranter and raver, his leadership is underrated. I can remember his first ever 45 mins for us when he came on at HT (in the 6 as it happens) away to Chelsea and he talked Keita through the entire half. That type of leadership and experience will be invaluable for not just the new signings but players like Jones, Elliott and Bajcetic.