You stated "spending time on validating serial numbers". Did you validate the serial numbers? If they were valid why would you still question its authenticity? If they were not, then you have your answer? What is missing here?
The one thing I see here is the headset top cap, (not the cap that sits on top of the stem) the one that seals the headset into the headtube. Pinarellos use their own cap with their name on it.
Groupsets are not an indication of genuine or counterfeit. Authorized dealers sell frames with fork, headset and seatpost, so you can put any groupset on it that you want.
Is the bottom bracket Italian? It should say "Think Asymmetric" on it twice and Pinarello twice.
The red bike says "Torayca 1100 space carbon". That paint scheme should only say "Dogma F10 Pinarello" in that area.