EXCLUSIVE The Giants SHOULDN’T bench Eli Manning — they should block for his ass — ’cause he’s still a great QB … so says the guy who won 2 Super Bowls with the embattled star. TMZ Sports talked to Brandon Jacobs — Eli’s NYG teammate from 2005-2011 — about the 1-5 Giants’ crappy offense … and whether it’s time to put Manning on the pine. “I still think right now, I think Eli is great.” B.J. says Eli’s gotta be used right, ’cause he ain’t the guy to operate a run-and-gun style offense. “Eli’s a pocket passer. He’s a pocket passer. He’ll sit there and get balls off and put balls in small areas. I’ve seen him do that.” It’s true … Jacobs was on the field for a bunch of huge moments — including David Tyree’s “Helmet Catch.” But, if Manning’s still got it … why do the Giants have the worst record in football? Most of that blame falls on the NYG struggling O-line. “I wouldn’t trust the guys in front of me if I was him,” Jacobs says … “Ya ask me, the poor guy’s shell-shocked.” Block for the man.