Same thing at the school I train. Guys are blown away when they see or hear of us rolling with our coach. He's real competitive and super technical all while giving his student the opportunity to learn. It's like fighting a Jiu Jitsu magician. Huge learning experience. I must roll with him 10 times a week. I feel it's a sign of a great teacher who has a lot of humility.
Oh I also train with a Marine Corps Veteran of Afghanistan. He took a bullet to the head. He has a similar story of injury and recovery. Almost seems like sometimes he doesn't feel comfortable in his own skin. He says getting tapped on his wound is like hitting a reset button. I try to drill with him after every class and prefect his technique. If you're comfortable with blue for now, go with it. You've earned that purple, it'll be there when you feel your ready again.