Hes always been a defensive coach. Thing with a defensive coach is you need a Cf that's going to take that 1 chance you might get in a game and unfortunately you sold him and we're unable to replace.
Players youve signed are decent players goig forward. Sigg is a good player, although his stats last year were slightly inflated due to set pieces. Klassan is decent player but Dutch players are always hit and miss.
Rooney as a link up is still doing decent enough job, just has no one in front of him to link up with.
You just seem to lack some serious pace without delafou and mierreles not playing to be able to counter on teams which you need if you're going to be defensive.