En fait, I think it might be the more dominant he is the less he might win by. Not exactly, but what I mean is, if he wins the tt and has a 30 second advantage, he might be content to take say 30 seconds on the first mtf follow wheels on Aprica and might as well then follow wheels on Sestrieres which will be the last stage. No need for more.
If however he loses the jersey in the itt and can't take it back on Campiglio he's going to to "attack to crack" on Mortirolo and Finnestre and maybe early on the Cervina stage. In which case if he does succeed, he will drop his opponents 30k out on one of these stages or might even fatigue them out totally for the rest of the giro and could be more in the 3 -5 minute range once all is said and done.
For example. Conta had a slightly bigger advantage to 2nd place and an all round bigger advantage to the rest of the top 10 in 2012 when he was weaker, than 2014 when he was clearly the strongest rider in the race for the 2nd half.