Hey Castellan, just pointing out that Grumbald never actually invited Clang along - Clang joined up with Alfons and Darterity after they'd met Grumbald.
That said, your post doesn't make it obvious that Grumbald invited him along - he's pretty defensive about it, so maybe he's either pretending he invited Clang or forgot that he didn't (though that would be hard to forget).
Also, I had an idea: give Clang a chance to demonstrate his strength (and/or willingness to take orders) and he should be welcome on the crew. Maybe Lark can safely ditch some equipment used for heavy lifting to make up for Clang's extra weight once he sees what he can do.