chain adjustment

So I'm at my mechanic the other day so he can check the spokes he recently replaced on my rear tire and I mention that it's a bitch to adjust the chain on the GZ because I can't get my torque wrench in there without taking off the muffler (at least the back end). So he suggested I try to loosen the rear axle from the other side to do it. Can we do that? I know the manual says to loosen the axle from the muffler side. I really trust and respect this guy, but is he off on this one.

Thanks,

Keith