While we all agree a striker is a huge priority, I don't think people should underestimate the value of this signing.
While I'm not saying I'm an expert on the guy, he's young, key part of a good Brazilian team who is keeping some fairly decent players on the bench.
We should also realize while Sandro/Dembele was extremely effective last season, once one of them was injured we looked a lot less effective, so this guy allows us more cover and more flexibility, he also brings a few goals with his head (addresses two big issues for us, very few people on team score goals with their head, and very few of our players attack the box)
5-6 years ago, people would have laughed at Spurs fans for even saying we would sign a guy like this, now, we are "meh, decent player but not a priority"?
Lloris signing should have shown people, if you have a chance to sign a good young player, even if you have the position covered, go ahead.