Charles Schwab's Liz Ann Sonders notes the earnings surprise and following rallies in tech stocks comes in conflict with concentration risk. That said, she believes bulls still hold the reins of market momentum. She explains how tests ahead will rattle the AI-led rally, including developments around the U.S.-Iran War. Liz Ann adds that "casino-like" moves in short-term money still holds some value as fundamentals climb, but as she says, "no one went broke taking profits."