I pretty much expected Luffy to pick up some subordinate crews after his match in the tournament. At the very least, the happou navy and bartolomeo. The tontatta tribe becoming a crew seems uncharacteristic of Oda, and Absalom and Jett pretty much got shoehorned in with the arm/leg dudes just because I presume Oda didn't know what else to do with those guys.
Of course, a lot of people have been joking on reddit that it wouldn't be too surprising if Luffy just says "No" in the next chapter. :^)