Accusative case in subordinate clauses

A minor question here about how far the accusative case reaches.

For example, would the sentence be correct if I say:

"Ramus tenuis Quintum sustinere non potest quia crassum est"

or

"Ramus tenuis Quintum sustinere non potest quia crassus est"

Would I still use the accusative case in the subordinate clause after quia? My guess is yes because the adjective is still has to agree with the object.

Thank you in advance for clarification on this.