If you look at the stats comparison. Norris defensive stats are a little better and Cozens offensive stats are better
5on5 rates
Cozens leads Norris in
CF%
FF%
SF%
GF%
xGF%
SCF%
HDCF%
MDCF%
LDCF%
off zone face off%
1 player comparisons on defensive stats are a product of team defense. When they are close concluding/complaining that one is so much better defensively is a little misleading because you need to look at more than just one player . I do not believe Cozens will hurt us defensively once he settles in with his line mates and team systems and he will quickly. He has been a force defensively before. He is much stronger on the forecheck as well.