The worst part about these discussions is the idiocy that comes along with "my co***ck is bigger than yours" statements and overall douchebaggery.
A "straight" art is something that focuses only on one aspect. If I am a great kickboxer I will do well against another striker and possibly a grappler however if the grappler gets clinch I am most likely fu**cked. Training striking from the clinch as opposed to stand up with distance is two different things and are trained differently.
Also, a straight grappler is going to have a hard time dealing with strikes if he is not used to it. A pure wrestler or pure BJJ guy who gets his shot or takedown stuffed and starts eating knees and or liver and rib shots is going to have a hard time dealing.
Really all this hypothetical BS is just that, Bull Sh**it!! Train all areas and be ready. Stop nut riding a style, I assure neither an old master from China or one of the Gracies give a sh**it about you honoring their style. The mere mention of it is retarded and makes me want to vomit!!
"The hero and the coward both feel the same thing, but the hero projects his fear onto his opponent while the coward runs. 'Fear'. It's the same thing, but it's what you do with it that matters". -Cus D'Amato