Who's definitely better than Stanzi? Landry? Meh...I don't see how he's obviously better than Stanzi. RG3? I could side with that, but I doubt they go in that direction. Stanzi is a legit prospect. I'd rather roll with him than anyone aside from Barkley/Luck considering they already have him in their system. Same reason they don't draft an OT. They'd rather go with Richardson, who has good experience with the team than draft a guy who wouldn't for-sure be able to out-perform him in the present and even in the future.
They're not going to win just 4-5 games for the whole season. They'll have 4-5 wins going into the gauntlet. Where they go from there really depends on how the team adjusts and develops in that time span. We could be looking at a team that has a chance to win some games in that gauntlet.
You play to win because this team needs that success. They're really close to being one of the best teams in the NFL. They lack playmakers and depth. They're one off-season away from getting a full package out on the field, but they're still good enough to contend for the playoffs this year. It just got a lot harder from losing two games they expected to win and losing key players to injury.