Even as the 49ers make a late-season push that could carry them back to the Super Bowl, everything isn’t completely perfect.

Tim Kawakami of the San Jose Mercury News shines a light on what he calls “creative tensions” between coach Jim Harbaugh and G.M. Trent Baalke. With Harbaugh, who doesn’t have final say over the roster, due to get a new contract after the season, Harbaugh could be trying to parlay his success into more control over the team.

Kawakami points to a couple of recent incidents as proof of a potential problem. With fullback Bruce Miller out, Harbaugh publicly declared the team would bring back Owen Marecic. And Marecic wasn’t brought back. (Kawami, citing an unnamed source, says that Marecic chose not to come.) Also, Harbaugh’s open plea for kicker Phil Dawson to return next year was seen by Kawakami as a message to Baalke.

Kawakami attributes some of the push and pull between Harbaugh and Baalke to the placement of “two alpha dogs” in the same environment for three years. But Kawakami reports that the relationship has indeed changed between the two men over nearly three years of working together.