Yes of course!
The more coaches you got at their best roles you will have more stars for each training category,and more that stars the players will better train!
I am sure that in Tottenham which you are managing can buy good stuffs!
It is better to have fewer better staff. 1 per training area, if you can get away with it (ie they are not being overworked). Sometimes because of board restrictions this may not be possible, but this is where First team coaches, and youth coaches are useful.