People put Shanle down, but he was a solid LB for us for many years. However, you're right that Werner is much more athletic. Werner's RAS is 9.49, while Shanle scored a 6.79. Werner's 6.9 in the 3 cone and 39.5 vertical are very impressive, and couple that with an above average 4.62, good instincts and a good tackler make him promising.
You can find Werner's RAS here:
https://crescentcitysports.com/saints-draft-ohio-state-linebacker-pete-werner-with-second-round-pick/#:~:text=Pete Werner is a LB,LB from 1987 to 2021.
You can find Shanle's here:
https://ras.football/2017/01/17/lb-relative-athletic-scores-ras-table/