I can't understate the impact getting Allen back will have. They will have a C to make the correct OL calls. Stafford won't have to do double duty and can focus on what he sees in the secondary. No more excuses for delay of game penalties.
Jackson looks like a solid LT. Aboushi at RG isn't a great player, but he should be serviceable and most of all experienced. With luck, Allen can focus more on support for whoever (Edwards or Evans) is playing LG. Give Stafford time and give them a modicum of a running game. With Jefferson back and Robinson beginning to click with Stafford, it will return McVay's layered passing attack.
Defensively, control their run attack and force Jimmy to beat you. Morris needs to quit playing his CBs 10 yds off the LOS for god sake! Quit conceding the quick 5 yd completions. Don't make it easy for Jimmy, give the pass rush time to get to him. Their OL isn't as good as in has been. Morris needs to play aggressively the entire game not just after they get into FG range and in the 4th quarter.
I hope that Morris gets hired as an HC so they can get a real DC. There is no reason this defense can't be the #1 unit in the NFL. But they have a whimp for a DC who plays scared. If Morris grows some balls the Rams can take care of business against the Niners and get their season rolling.