Even for a win-now, splurge-“Mo”-splurge guy like myself, the idea of the Cardinals trading for Juan Soto is a tough one to back. A lot would have to fall into place — and executive John “Mo” Mozeliak would have to do an about-face regarding his business model. It would cost decades of team-control years. And possibly three key young guys from the current Cardinals, let alone prospects, too. If a trade with Washington means also taking on Patrick Corbin — perhaps the worst pitcher in the National League who still is due nearly $60 million in 2023-24 — then you don’t make a trade for Soto. If i…