Do not mistake employment in big law for infallible expertise. I deal with exactly this on a daily basis - patent litigation, IPRs, counter IPRs, NPEs, PEs. Regardless of their background, they do not want their assets facing IPRs. IPRs introduce delays, invalidity risks, and costs.
https://www.cloudflare.com/priorartsearch/
Any idea who are the Cloudfare outside attorneys?