If you are sending from the primary to a delay FX, that delay FX track should be 100% wet, in which it will not double the source signal. The return signal from the delay FX track will only be the delayed signal to the parent track. The primary track will still have the source signal to the parent track.
If you do not have a 100% wet mix for the delay track (or ANY return FX track like reverb, parallel compression, etc) then yes you would have more source signal in the parent track.
hope that helps!
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