Using your interpretation skills, you would stick with a QB throwing 50% and constantly fumbling because the backup might do the same?
Sorry, I didn't answer your question. Honestly, after the last 6 years I'm pretty desensitized to anyone on this team fumbling. I most definitely don't believe it's a problem exclusive to Armstrong. Throwing 50% is obviously not ideal, but it's certainly not the deciding factor of who gets to play and who doesn't. Who gives the team the best chance to win is the deciding factor. All signs seem to indicate that the coaches and team think Armstrong is that guy.
He threw under 50% in the bowl game, but overall I thought he played as well or better than Martinez ever did in any postseason game. He showed a lot of poise for a freshman. He didn't try to win the game on his own on every play, which is what I think his biggest downfall was throughout the season - not too surprising for a freshman. He threw some clutch passes which were the difference between our first postseason victory since 2009 and just another postseason loss. He threw the longest touchdown pass in the history of the game. Most importantly, I thought he managed the offense well and helped keep us on schedule. So overall, I think he has shown improvement, maybe not enough to meet your standards of "deserving" the starting spot, but he has improved.
Now, if it was true that all he did was throw 50% and fumble, then you would have a point worth examining, but when you base an argument on hyperbole it's difficult to take it seriously. Especially when you're already calling to replace him with a guy that was 3rd string as of the spring game.