If Stroman and Sanchez pitch 194 and 164 innings (nearly double what they pitched this year) I'd expect both to beat their projections of 2.4 and 0.9 WAR. Obviously that's a big if! I don't agree with the narrative that Sanchez has shown nothing, and he's hardly had any injury free starts in 2 years. This year is obviously vital for him to first try to have a run of no injuries, and then prove whether he's still a legitimate starter when fully fit. If he gets injured again he won't get any where near the projected innings.
With the seemingly limited budget and therefore assuming we don't sign multiple starters, Borucki and/or SRF should get 20+ starts . If that happens it'd be disappointing if they both suck.
I doubt we see Merryweather in the rotation until late in the season. Gavligio fits as a 5th/6th starter type. Pannone has more chance of cracking the 25 man as a reliever IMO.
So overall, in a year where we aren't expected to be a serious contender, IMO our rotation isn't that bad with 1 or 2 sensible additions. Meanwhile the bullpen has Giles and the usual random chance pieces, that bar spending serious money is fine. There will be a few relievers that have good seasons out of nowhere, a few that are terrible and are DFA, and the usual turnover that we always see.