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Running with a mild cold is a good way to make a vile cold in my book.
Don't think much of rushing back to running until feverish feelings are long gone either. Virus things are a little bit like scorpions: the sting is in the tail.
Yes, so you miss a couple of sessions. So?
I doubt there is any real substitute for figuring out how your body responds to colds and running, and stick to what works for you, whether or not it works for anyone else. Part of the real plus of running training is that you learn to make decisions based on your own assessment, and not merely following someone else's rules or instructions.