Delighted at VDB - certainly preferable to Alli, RLC and probably Lingard - right age, has something to prove and, even without a buy option, he might be able to be persuaded to stay if it works out. Plus I don't think we've seen anything like the best of him in this country yet.
But, if Lampard does want to play a 433 then we are in desperate need of a number 6. Allan can't really do that, as we've seen. Gbamin wouldn't appear to be the answer either. Gueye is the only one we've been linked with, but even he is more of a ball-winner who likes to go and press around the pitch, rather than sitting and being positionally astute which is what you want from a player in that area. Still, better than the options we currently have.
The other glaring gap I think we have (well, the most pressing one) is left back. I know we've just signed one, but as things stand he's the only natural left back at the club and there's a chance that he may take a while to bed in yet - an injury to him would snooker us. Delph is injured and although Godfrey can play there, sort of, Lampard has relied on his full backs providing width and crosses at previous clubs and Godfrey won't do that. I'd say a left back on loan might not be the world's worst idea.