It's not even true that Pep gave him more minutes. Someone set this myth in the world and everyone is repeating it now the same way everyone is crazy for ter Stegen for some ridiculous reason although it's obvious that absolutely no one on this forum has every watched a single Mönchengladbach game for full 90 minutes.
When Thiago was fit, Tito gave him 1200 minutes in the second half of the season. Pep gave him 800 minutes. Despite 3-4-3. Fabregas had a stinker of a second half yet it was Fabregas who started against Leverkusen, Milan and Chelsea in the knockout stages. Thiago only played the Camp Nou league Clasico because Pep had to rest Fabregas and Alexis 3 days before the Chelsea return leg and the Clasico was the less important game because even with a victory Barca would have had less points than Madrid with only 3 or 4 games remaining (which Madrid went on to win anyway). Otherwise Fabregas was his prefered player in big games as evident in his minutes in the CL knockout stages. Thiago didn't play more and Thiago didn't play more big games under Pep.