Going back a calendar year, here are the comparisons for TAA vs RJ (where percentiles used, for fullbacks in the top five European leagues):
Non penalty xG per 90:
RJ: 0.05
TAA: 0.07
Shots per 90:
RJ: 1.23
TAA: 1.30
Assists per 90:
RJ: 0.11
TAA: 0.21
Shot creating actions per 90:
RJ: 2.79
TAA: 3.08
Pass completion %:
RJ: 83.1%
TAA: 74.5%
Progressive carries per 90:
RJ: 6.97
TAA: 6.31
Dribbles completed per 90:
RJ: 1.27
TAA: 0.88
Pressures per 90:
RJ: 14.84
TAA: 9.02
Tackles per 90:
RJ: 2.47
TAA: 1.72
Interceptions per 90:
RJ: 1.20
TAA: 0.74
Blocks per 90:
RJ: 2.94
TAA: 1.09
Clearances per 90:
RJ: 2.07
TAA: 1.91
Aerials won per 90:
RJ: 1.92
TAA: 0.19
These two play in very different systems for managers asking them to do different things. Liverpool have more of the ball than Chelsea which depresses the defensive stats a bit. But also watch the kid play, he can’t defend anyone at the moment.
You’re essentially choosing a dead ball player. One that can be replaced with Ward Prowse or amount. From open play it’s laughable you’d choose Alexander-Arnold over the clearly superior two way player in James.