I did try just using AUX in and it was coming out the main outputs. I figured out another solution that doesn't use a block. Set AUX IN, Set headphones to monitor main outputs, put all guitar chain on path B, give FOH the Send output. In that setup all I would hear is the monitor feed, but I my guitar will be in there anyway, so no problem. Actually, that might be the smarter way to do it and it leaves all 6 blocks available. The only downside is I can't use a separate path in making my guitar tone, but I never do that anyway.
Thanks guys! You got my gears turning and now I have a couple of solutions to try out.