In 2008, Matt Olmstead told us the writers room was in awe of Fichtner. But to hear Seth Hoffman tell us that exact thing 17 years later when asked in general, really shows you the impact of Mahone with them.
First clip is a featurette uploaded by Kouheikun op Youtube: https://youtu.be/FBahN0h1Kpo
Second is the episode of Podcast Prison Breaking with Seth Hoffman: https://youtu.be/rGcdoteq0A8?t=1828 (30:28)