I believe that is how we had everything hooked up on 2 of the phono systems.

Turntable into Phono input on Marantz receiver
Heos pre-amp hooked up to 12 channel amp
Heos portables in 1-2 other rooms

1 - Get turntable playing in Z1
2 - Attempt to group turntable input into Heos to play pre-amp and portables
3 - Major delay between Z1 and Z2 (step 2 above)

I'd have to check with our installers to see if the same issue was happening with other sources but I know that it was with turntables.

Thanks!