Well if you ask me I would take Fer over Mulumbu and Brady has not proved himself yet for me to be any better than Pilkington and Snoddy were. Both can ofc be major success for us, but as pure player talent perspective we had equal couple seasons back and these two are the major signings this season.
Compared to out championship squad we have brought 3 to 4 starters. Decent ammount, but is Mulumbu big improvement for Howson, Tettey, and Hoolahan? Dorrans brings some depth, but cant see him more than squad player even thought he has been most succesful from our signings this far. Howson and Mulumbu are probably better box to box and Hoolahan should play always when fit if we play one upfront. Defensive role isn't for him so he wont challenge Tettey.
Brady is only real improvement this far for our starting eleven and that is mostly because we didn't have natural left winger. Now we loaned thank god Jarvis that we are not without wingers if Brady or Redmond gets injury
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So that leaves Wisdom and Mbokani. Jerome in my papers is our best striker until proved otherwise. Wisdom could be a starter, but we dont know that yet and seems that Whittaker is in AN's papers front of him so he was not signed as a improvement but for squad depth purposes (which is completely good reason to sign player, dont get me wrong here)
So at the end we have clearly improved one slot from our championship squads starting eleven. We have brought 3 players in purely for squad depth (Wisdom, Jarvis, Dorrans) who can compete for starting places when in form or starters out form (and had one of them already in championship as a rotation player) and 2 players that are at least par the level of our current starters and remains yet to be seem do we consider them first choise or squad players.
We are awfully thin in our defence with 7 players Toffolo included for 4 slots. Midfield is ok with 7 players for 3 slots and attack the same with 4 players for 1 slot. Wide players will have some problems if any of them get injured long time as our midfield wont gives us same penetration if played wide and Grabban is kind a only striker who can really play as invert winger. I probably forgot someone, but in my opinion window wasn't succesful and our squad balance seems very fragile.
Good team spirit and solid coaching can keep us up, but I personally will be very surprised if we are out of bottom four at the end of the season. We took quite a gamble with a luck.