Yesterday the Guitar World website posted a listicle of fifteen of the most well-known guitarists to be included in the "progressive" category - both Trevor and Steve Howe were named, which is a nicely inclusive decision, in my opinion. In the spirit of twinned nods Robert Fripp and Adrian Belew of King Crimson were noted as well.
http://www.guitarworld.com/artist-news-artist-lists/15-prog-rocks-best-guitarists-through-years/29666
Listed among the legends is one of Trevor's primary influences, John McLaughlin, also innovative titan Frank Zappa, and Jon Anderson's recent collaborator Roine Stolt.