There's no right or wrong way. If your method works for you then that's what you should do. However, try it the other way and let your ears decide. Things that don't make sense in theory can sound quite pleasing to the ear, or at least unique to that track. The only actual rule when it comes to routing is keeping your equipment electronically safe (ie feedback loops, overdriving inputs etc). Historically, some of the coolest albums are the ones where the engineer does something nobody else would think makes sense.