People like RC are bought and paid for by a small pacific island, likely would either go against their contracts with the big kahunas or could hurt his relationship with a fat paycheck to test, especially favorable, to a small outfit with no ties to him.
So, even if he would do it, he would not score it favorably even if he wanted to (actually shouldn't score any stock production bike good based on what they ride). Plus, he is not a magazine style tester like Super Hunky as John said, he requires bikes that are molded to his body. I mean, the bikes he raced they took a plaster cast of his body and formed the bike afterwards.
Also, unlike Super Hunky who would do an honest test I don't think any magazine tester (let alone a big name racer) ever would anyway since even other magazine testers were not doing it 30 years ago since they would loose ad dollars (I'm pretty sure Dirt Bike magazine lost some ad cash for showing how ill-handling some of the bikes were back then).
As far as new Maicos looking like a YZ, I don't really see it but even if it did that's not a way to test a bike. "Ok, I am testing these new bikes, ok, KTM looks like an orange so must suck. Honda looks like a red apple, so probably sucks. Ok, RM looks like a sun since it's yellow, I think thats the best bike because I like the sun".
Look at this
Jaded Ad