Anyone who would come into another school saying that his former art is the "thing" rightfully deserves to get taken down by the master. Being good at something requires that you understand what it means to be bad at it and the more you learn, the more you become aware of how much you don't know. Generally, you can tell if someone is a good martial artist by how humble they are.
If this fella is coming into your school acting like he's the best thing since thai pads than you owe it to him to bring him down a notch.
As for sparring, i'm not familiar with flow boxing, and i don't see how aikido sparring would even work.
Good luck though.
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