I love your optimism, but 3 of those 5 players were playing in a much lesser league for all/majority of their contributions.
We've seen 2 years of Doku, who won't improve his numbers any further
Savinho doesn't want to be here, albeit i do think he's the more likely of the wingers to contribute
Bobb looks a good prospect, but not someone who would have been a regular during the treble campaign
Marmoush, let's wait and see, but he certainly won't get anywhere near 34 G/A playing out on the left
None of these players (Foden aside) get in the treble winning squad, and yet we are now relying on them to carry a lot of the weight in terms of G/A; id also argue that none of them (Foden aside) get into Liverpools, and potentially Arsenals team