Rivalries make sports great. There’s nothing like friendly — and oftentimes not-so-friendly — competition. And the Niners have a new archrival. Yes, to most, the Seahawks are the 49ers’ top rival — that hatred runs deep. But there is something brewing between the 49ers and the Rams that cannot be ignored. And it boiled over this weekend, when the Rams traded for Matt Stafford, outbidding several teams, including, reportedly, the 49ers. From the outside, acquiring Stafford looks simply like a play to improve the Rams’ Super Bowl chances for next year. But from my vantage point, it was the rival…
