It actually was money based, 12HawkFan nailed it. Do think some of the posts here are fun to read.
Hauschka was very very well paid and had cost the team two critical losses, and he was a FA and there were other team priorities: i.e.: the OLine the team wanted to address. Hauschka was able to find a big deal in free agency. So they signed an allegedly strong legged kicker who had confidence issues to a 1 year minimum contract hoping to have him regain the ability and confidence he showed in his first season at Minnesota. I suspect this was thought to be a boom or bust signing and the team brought in challengers for the job during the preseason, but Walsh won. The team seemingly has not won on this boom or bust gamble.
It's apparent that Walsh either has the yips or is very bad at adjusting his angles kicking when he needs to compensate for wind, etc. He's now cost the team at least one game, and he's certainly not helped in numerous other situations crushing momentum during necessary comebacks. I suspect Walsh doesn't enjoy much team confidence either as he struggles with accuracy and has apparently lost his length. This experiment will be over after the season unless things really change. I doubt that will be likely.