Why it made no sense for 49ers to make blockbuster move at NFL trade deadline

The 49ers pulled off four trades in the past five months.General manager John Lynch beat the NFL trading deadline by seven days when he completed a deal to acquire defensive lineman Keion White from the New England Patriots.He should have waited a week to avoid the appearance that the 49ers did nothing while there were moves aplenty across the NFL.Despite multiple national reports of the 49ers’ aggressiveness in pursuing high-profile trade targets, the team did not make a deal on Tuesday.It was not exactly a surprise.Coach Kyle Shanahan outlined his preference — and the preference of everyone in the building — a couple of weeks ago.“Of course, we want someone to help us out this year, but I’d love it not to be at the expense of our team next year also,” Shanahan said.His comments came at a time when the 49ers already had lost their two biggest stars on defense, Nick Bosa and Fred Warner, to season-ending injuries.Those absences for the remainder of the season lowered the ceiling on just how far the 49ers could go this season. And when promising 49ers rookie defensive lineman Mykel Williams, the No. 11 overall pick, sustained a torn ACL on...