First off, I have added two additional racks to my WSM using the threaded rod method on the mods page. I left enough room for ribs on each of the standard grills. I plan on putting chicken thighs on the new upper grills I added. I'm not sure if this is a stupid question, but... Is there anything wrong with the chicken basting the ribs, the ribs basting the chicken, etc.? The chicken is generally done at the 4 hour mark and the ribs around 4.5 hours generally.