Working with Pro who is missing last year's data

I am starting work with a young man who is a pro in the USA. He races crits. All of last year he road with no computer…….. I am getting him set up on xert and will be coaching him this season. What are some workouts or steps that I can take to help get him profile rounded out. He does have some files from the last month or so as I bought him a new computer. I plan on curating his training until the AI has a good handle on the kind of rider he is.

You could ballpark a starting signature using the Power Curve Calculator.
Power Curve & Calculator – Knowledgebase

Then on an especially fresh form day perform a standard fitness test workout to verify the numbers. (Outdoors or indoors in Slope mode.)

Moving forward you’ll know soon enough if further tweaks are warranted.
How to Verify Your Fitness Signature — and what to do if it seems wrong – Knowledgebase.