Kevin Warsh's Fed chair nomination hearing on April 21 revived debate on market stress linked to new Fed chairs.
Deutsche Bank analysis of 50 years shows record, with chairs like Greenspan triggering early crashes while others saw delayed or no turmoil.
Warsh's support for rate cuts, Fed independence stance, and preference for a smaller balance sheet could clash with expectations of no cuts.
Senator Thom Tillis threatens to block Fed nominations amid DOJ investigation of Powell, potentially delaying Warsh's confirmation.