AI risks and private credit concerns sent the 10-year treasury yield below 4%, says Charles Schwab's Collin Martin. He points to the data center buildout dampened by CoreWeave's (CRWV) earnings sell-off adding skepticism in the tech trade. As for what JPMorgan Chase (JPM) CEO Jamie Dimon calls "cockroaches" in the financial space, Collin addresses what differentiates the good, bad, and ugly in private credit.