The FO has already said they aren't going to rush out and bring in a FA RB. They are being smart and waiting to see how their depth looks during TC. Also, there is no telling at this point how severely Akers is injured. If his long-term prognosis isn't good then IMO they will go with who they have and then draft a RB next year.
They are two deep at RB with Henderson who is every bit as good as Akers, and speedster Funk who also isn't a smurf RB. The forgotten man is Calais. I think they would keep Calais over Jones simply because he has the speed lacking in Jones. If Raymond has polished his technique after a year on the team he can make the case to be #3 RB. He like Anderson is a smaller RB who has speed, agility and good field vision. The problem with Jones is his lack of speed, and there are questions by some scouting services about his field vision. Anderson is a small RB whose run times have been all over the place from 4.3 to 4.6. A friend of mine who does analytics says his game videos put his play speed in the 4.4-4.5 range which is what I think the Rams noted and why he was signed. He's also, quicker than fast with good acceleration, vision, and agility. If he shows that in TC then I see him as the Ram's #4 RB. I see no reason they can't go with those 4 this year. I originally envisioned Calais being released in favor of Anderson but the Aker's injury has changed the dynamics of the position. The speed of Calais and Anderson offer McVay offensive options he doesn't have with Jones who lacks that sideline to sideline speed to threaten the perimeter.
Next year they would get Akers back and they probably would draft a RB. The Rams have a boatload of FAs next year so I don't see them spending cap this year they will need next year. If they keep 4 RBs like I expect them to, then Henderson, Funk, Calais and Anderson would seem to be the most likely candidates. People had questions about Darren Sproles at 5'6" and his 4.49 speed. But his acceleration and vision made him a playmaker. Both Calais and Anderson are bigger players, both have good acceleration with Calais being faster than Sproles.
So I think the Rams are fine with Henderson, Funk, Calais and Anderson as their RBs assuming both Calais and Anderson look good in TC. Being concerned certainly, but it's no reason to panic. If the three young guys show as expected in TC there shouldn't be a problem this year. I think McVay will use Henderson and Funk in rotation more than he would have used Akers and Henderson. That IMO is not a bad thing. Overuse of Gurley led to his early decline and Sean needs to be mindful of that.