Re: How did Cam have time to build his morpher?
 

The Samuraizer was an old aritfact that they already had. Lothor knew about it as well. When he was still Kiya the next phase of his plan was to steal the Samuraizer.

Re: How did Cam have time to build his morpher?
 

Maybe he returned to a few hours earlier to give himself time to set everything up?