Frankly I think your know-it-all predictions have more to do with your blind faith in weather forecasting and cold temperature characteristic assumptions that any solid foundations upon what exactly the gains might be on an engineering basis. You've called everyone who doesn't agree with you "delusional" in this thread 3 times now - despite, I assume, not being in possession of a time machine or an employment contract with an F1 team.
Sorry if my predictions came out as arrogant but I try to base everything, possible, on past experience and on known adjustments/corrections. The cold temp is a tricky one because in some years it accounted for more than a second, in others for 0,7s. It depends on how much people sandbagged on winter, how hot it was in the GP time and etc.
The 1,5s improvement from PU+aero is purely a personal guess. I didn't call anybody deluded because they disagreed with that expectation. Some people said they expect 3s or more, I highly doubt that but there is no base to know who's closer to it, so I would be stupid to call people deluded when we're all purely guessing on that specific matter.
When I said race_addicted was deluded, it was because, with a much worse PU, Lotus was 1,7s slower. So, with an equal PU, how can they be 2s behind Mercedes?!
If someone posts that he thinks Sauber will be a front runner this year, is it ok to say he's deluded? I guess we would all be ok with it because we base on last year that this is highly unlikely. The same with Lotus now having a much better PU and likely closing the gap to Mercedes.