Michael Crabtree celebrated his 22nd birthday Monday. As an unwanted gift, multiple reports surfaced that the 49ers are poised to drop their offer to the No. 10 overall pick out of Texas Tech. Citing team sources, Michael Silver of Yahoo! Sports wrote that Crabtree's continued absence makes him less valuable to the 49ers on a prorated basis and added, "Translation: The team just reduced its offer and will continue to do so with each passing week." A day earlier, Jay Glazer of Fox Sports reported that the 49ers sent a letter to Crabtree "modifying" their offer. Responding to the Fox...