Jujitsu boxing and mma ?

Believe it or not there may be CERTAIN cases where boxing and jui jitsu would be sufficient...with that said...the more you learn the better off you are...but to use an example...one of my favorite fighters, Mac Danzig, specializes in Boxing and BJJ, hes looking pretty sharp right now, and even though im sure somewhere along the way he practices kick boxing, the principles of boxing and BJJ in the right hands can be ver dangerous...being a proficient boxer makes you capable at ending a fight at ANY moment, just the same, being good at BJJ enables takedowns and takedown defense, with submissions and ground game obviously...conclusively, if your taught what to look for and you can counter and survive low leg kicks...and kicks in general...then yes, JJ and Boxing MAY be sufficient..but learning more is always beneficial.....also to clarify...when you say MMA in between...MMA is mixed martial arts, so if your studying jiu jitsu and something else, boxing or kickboxing, you already are MIXING martial arts.....