I think the double line is a problem. "Qui-Gon would never join you" to "I will never join you" is not right.
"Qui-Gon would never join you and neither will I"
or
"Qui-Gon would never join you and I won't join you either"
Would be natural ways to express that sentiment, of course Obi-Wan doesn't say that ;-(
The disgusted way Obi-Wan says "Qui-Gon would never join you" implies the second statement anyway.
I don't think anybody would be thinking Obi-Wan would say...
"Qui-Gon would never join you but me I'm flexible"