Yeah I guess that can happen. To be successful we would need our two widest cms in the diamond to have great stamina and be adept at going forward and back (only Harper/Field currently being generous?) and our full backs need to be a bona fide threat going forward. Work to do for sure.
Not against the idea of a diamond formation but they often tend to be quite narrow, whilst we have a number of players who primarily play in wide positions (Phillips, Brunt, Burke, Edwards) and are trying to sign another (Pereira).
As it looks like we'll be going into the season with a bare bones squad, we are going to have to just look at the players we have and see what formation is likely to suit best. I feel that unless we get a decent number of first-team-ready players in between now and the end of the window, Bilic is going to be limited in terms of flexibility and variation.
In my opinion, 4-2-3-1 seems most likely to fit what we have at the moment, with Krovinovic playing the 10 role behind (by the looks of it) Zohore. Two of the aforementioned wide players would be on each side, with Field and someone else (hopefully not Livermore, maybe a new signing) holding - a sot of poor-man's Mulumbu and Yacob.
Johnstone
RB Bartley Hegazi Gibbs
Field
CM Phillips Krovinovic Edwards
Zohore
Subs: Bond, O'Shea,
(full back), Harper, Brunt, Burke,
(striker)I have included Zohore as it appears that the deal is done pending a medical. If we were to also sign Pereira then I would assume he will start ahead of Edwards.
This leaves 4 gaps to fill:
right back (to replace Nyom, who looks to be leaving)
full-back (probably another right back if we are sticking with Townsend as Gibbs' back-up)
centre-mid
striker
All of those are areas we know we need to strengthen anyway. I have just read that we are also interested in Vincent Jansson who has never delivered at Spurs but might be a good buy in the Championship provided his wages aren't too high. Should at least be an upgrade on HRK.