
Blaine Gabbert was the 10th overall selection in the 2011 NFL Draft.
Over three seasons in Jacksonville, he went 5-22 as the Jaguars' starting quarterback.
On Sunday against the Falcons, he will make his first start since Oct. 6, 2013.
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What can 49ers fans expect to see?
"The one thing that Gabbert will do is he will play within some kind of rhythm and timing within the offense," Greg Cosell, Senior Producer at NFL Films said on KNBR 680-AM on Wednesday morning. "... He's a pocket quarterback at his core."
The 49ers are last in the NFL in points per game (13.6) and yards per game (282.3).
Cosell supports the 49ers' decision to bench Kaepernick and go with Gabbert, but he also offered some words of caution for 49ers fans.
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"Obviously, this is a team with all kinds of concerns and issues on offense. Just making a quarterback change, it's not as if all of a sudden the offense will flow beautifully," Cosell said. "But Gabbert is a different kind of quarterback. He's used his whole life to getting rid of the football. Kaepernick is not necessarily used to playing that way. He's used to making plays happen by himself."
[MAIOCCO: Tomsula: Gabbert gets call over Kaepernick 'this week']
As a junior at Missouri in 2010, Gabbert completed 63.4 percent of his passes for 3,186 yards, 16 touchdowns and nine interceptions.
He rushed for 232 yards and five scores.
"I remember watching him at Missouri, and I had to watch eight or nine games because I had to find plays in which he had to actually had stay in the pocket for two, three, four seconds because I had to see how he would react to that, and he didn't react to that well at Missouri," Cosell explained. "And that was a major reservation I had about him coming into the league. I didn't think he was a strong pocket guy, even though he's a pocket quarterback and that played out in Jacksonville.
"But he has to play, you had to sit Kaepernick, but we'll see. My sense is that's in someone's DNA. I don't think all of a sudden he'll be a real strong pocket quarterback."