There is nothing wrong with learning two arts at once, MMA fighters learn up to 5 or 6 at once thats why it is called MIXED martial arts.
Wrestling is nothing like BJJ, you need both, trust me. Muay Thai, Wrestling and BJJ will have you nicely well rounded.
Practice them all and use what works and throw away what doesn't work. It's the way martial arts are going these days. As an example, one month ago, most MMA instructors would tell you not to waste time on front kicks, but Anderson Silva and Lyoto Machida have both KOed guys with them - keep an open mind.