Yes but how often and how were they drilled (given that itís taken that Koeman probably expected a certain level of understanding without the need for specific exercises)?
Plus by also having the other 2 in the front 5 as new players there are even more potential mis-reads / misunderstandings etc.
This is where the constant formation changes (not helped by the fixtures admittedly) were such a hinderance.
4/5 of these should be playing their 11th league game tomorrow whereas have we had Rooney, Sigurdsson, Klaassen more than twice? Let alone all 5.
The lack of understanding was definitely a problem but I think the biggest hindrance to getting the new players to function together was Koeman's insistence on long balls out of defense. Most of the new signings do their best work with the ball at their feet and options around them. Asking them to chase after scraps was a pretty serious miscalculation.
We basically built this team around a type of player we never bought. Which is embarrassing for all sorts of reasons. Say we got Giroud and he was, in fact, the perfect player to tie everything together. What if he gets injured? This squad needed a B-level target man too and it's a bit ridiculous that we didn't go for one. Mounie and Haller were not particularly expensive.