No but people are trying to play down expectations by comparing Alleyne to Diggins. The comparison should be to rotation players from last year, not people transferring out.
Here's how it could play out compared to last year's squad:
Sanogo: incremental improvement versus last year (+)
Jackson: at least incremental improvement to last year (+)
Newton: wash versus Cole. (0)
Hawkins: moderate to significant improvement over last year. Will he be as good as Martin? A wash to possibly a slight negative (0/-)
Johnson/Alleyne: Alleyne would bring a lot more offense than Whaley. Johnson has a higher ceiling than Whaley but how much will he have improved? Neither is likely to provide the defense that Whaley did. This slot could be a positive, a negative or a wash. Hard to say, very different players.
Bench: Clingan, Karaban, Castle, Johnson/Alleyne, additional experienced portal guard looks clearly better than Polley/Gaffney.
On paper the team would be improved compared to last year. Not top 10 but better.