I'd actually argue we are stronger in 2/3 of those areas. Tanganga is a worthy replacement of Anel. I wouldn't call him an upgrade, but certainly not a downgrade.
Bamford/Ings/Campbell/Cannon gives us a good variety of options. The only missing link would be an out and out target man - maybe Oné could fill that role - but I'd imagine this will be a high priority signing for the JTW.
The area we are undeniably weaker in is the role Souza filled. Riedwald isn't fully fit yet so it wouldn't be fair to say for sure he's inferior to Souza. Matos and Soumare are clearly not at that level yet, but have age on their side, Riedwald, as said, isn't yet fully fit
Let's be clear, this is not a bad squad. We have a strong championship squad with plenty of options when everyone is fit.
A target man, RB and CDM would be my priorities, and I assume they will be for CW.