In that case this is the best piece of advice I can give you. If you want to beat a grappler, you need to learn to grapple. Simple. BJJers train in a different way, with a different mindset and with different goals to most Aikidoka. The result is in a true application they are likely to have more functional tools availible to them. Or it may be better to say their tools have become more functionalised.
In the early part of the latter century there was an intense and rivalrous competition between Brazilian Jujitsu and Japanese Jujitsu. The Brazilians had been practicing in realtive isolation, developing jujitsu to meet their own culture and standards, boasting all the while that they were undefeatable. A match was finally called between the Brailiain team and the Japanese team headed by a sensei named Kimura. After rounds and rounds among the sempai, some leading to near death and broken bones, all appeared to be realtively equal. The event culminated in a fight between Kimura and the Brazilian Teacher that almost lead to death in the first match. The match was stopped. It was restarted just a short while later. In the middle of the heated match, after everything else was exausted The Japanese Sensei then brought out his secret signature move and pinned the Brazilian on his back to the floor and the won the match with that one move. The move is now referrred to as the 'Kimura' and is the backbone of many practicioners repetoir.Essentially it is still a 'signature' winning move in BJ or JJ. The Brazilians adapted it to their form and others to theirs; if they know to look for the move. It is in the essence of the Japanese Arts that this move emerged.
So, I have two thoughts:
Thought one: The answer to the original thread question woud be,in essence, The Kimura and the functioning properties of Japanese Arts as emerged from the land.
Our reasoning and method for training, as it is generationally passed down from the founder and his diciples, is to learn to Co-Exist not to Compete. They have very different end purposes and the way we practice the same moves as say, The Kimura, lead to a larger effect than winning a Brazilian. It leads to the possibility that we can, of whatever origin, Co-Exist with the Brazilians ( or name your favorite country ........here) based on unversal principles of nature that bind us all on this earth. If you ( One) end your mind at the thought of fighting and winning then you (one) also end your mind at the thought of death. Very un-samurai and very un-alive way to 'progress' in this mortal plane.
Domo Arigato Gozaimashita,