The beautiful thing about having a 4.4 QB in Fields is you can design the same misdirection-type runs with your TE,,WRs, RBs, and now mix-in QB for bootlegs, options, naked bootlegs, reverses, double reverses, WR tosses, flea-flickers, pitch and tosses..... the list goes on.....the 49ers would have top-shelf athletes at most of those positions for the open field -- now the defense is in a bigger bind, as they need to honor any one of those players, and the half second hesitation is good for 4+ yards much of the time. The run game will become magnified, just the way Shanahan likes it. If the 49ers also keep Garappolo, they may be able to afford to bring Fields in more slowly. If Garappolo's play falls off they can accelerate using Fields. I can't see them taking any other QB than Fields besides Wilson. You don't pass up 4.4 speed at QB as long as he's a satisfactory passer, unless the other option has some bigtime passing upside. There's no linemen in the NFL who could hope to catch Fields once at full speed, and many linebackers would have problems. I didn't like the trade-up at face value, but if they go after one of other QBs, I'll be more disappointed. Garoppolo has been a serviceable QB, and hopefully he'll get a chance to prove he perform at a high level and finish out his contract. Ideally you want to bring Fields in slowly as an understudy.