I would have guessed that at first, especially if you only needed to piggy-back just 1 guy (the 5th opener for TB), but how do you do it for all 3?
If Rotation is,
Civale
Williams
Bieber
Bibee
Allen (until Quant/McK gets back -- if he does/they do)
If, they do a PiggyBack, how many relievers does Tito sacrifice to that cause? 1 in Curry? With a 8-man pen, you cannot factor in 2 (leaving 6 for all the other work without pushing them to the limit as well). If they do a Gaddis, Allen (when Quant gets back) or Herrin, as 2nd long-reliever, who do they send down out of Clase, Stephan, Santos, Morgan, Hentges, Sandlin, Karinchak (fill-in)? Do we believe Karinchak was sent down for rest of year in AAA or just until he got fixed?
Also, Curry is the innings leader in the pen (as he was a starter). But, when he has gone 2+ inning, he usually has had 3+ days off (pitch on 4th day or later every time-- as only twice has he gone 2.2 innings on June 30 and July 3 both days - on 3rd day and May 28 - 3.0 inning and June 1 - 1.0 inn on 3rd day). It is not like he can piggy-back Williams and be off a day before doing Bibee 2 days later.
Instead of 5.5 innings on average start for 17 starts (which is already low for a starter, making pen work), are you limiting starters to just 3 innings in a piggy-back? Thus, you save 2.5 innings for 1 starter each time through the rotation? (17 x 2.5 = 42.5 innings over 3 guys = 14 innings per guy overall ... not a huge change. Even if it is 20 innings as Quantrill sends Allen down in a few weeks if healthy (and everyone else stays healthy), is that the real difference? This is especially true for Williams who has to be limited the most since becoming a full starter in 2021.
So please explain how piggy backing will really limit the innings that much for a long, playoff run, as I just don't see it???
Note, with a bunch of young starters, the pen has been taxed as is already, even before more piggy-backing (why Curry has so many innings already - he kind of started it already informally). Only 8 times this year (2 for Civale and 6 for Bieber) has your core starters gone 7 or more innings to give pen a night off. Thus, your pen doesn't have a lot of room to pick up even more innings by just waving a magic wand and saying it works. (And Allen, Williams and Bibee have gone 7 innings once, but that is counter intuitive to piggy backing mantra to limit innings - by saying your starters can give the pen a night off every few days).