I'm certainly not an expert on retaining wall construction, but here's what I know:
1. There is a footing layer which in this case consisted of a row of block the length of the wall which was set in some sort of medium or substance....it looks kind of like concrete that is two feet wide and eight to 12 inches deep.
2. There are anywhere from two to seven tiers of block above that footing, forming a wall that is shorter at the upper end and tallest in the section before the tapered lower end Each layer of block is held to the previous layer by that mesh that you see. There is no "mortar", so it can be taken apart without harming the individual blocks. Each layer (or course) is slightly offset back into the hill from the layer below it, to spread the ground pressure evenly against the back side of the wall.
3. The top caps are set with adhesive, which is similar to mortar except with more binding ability. If a large flat blade screwdriver is used like a chisel (with a hammer) to break the adhesive bond, the capstones should all pop off unharmed.
So yes..........the wall should have been repairable with the mortar and hand tools that BM left for his crew. What they did not have the tools for was the replacement of the earth and seeded ground mats that BM had moved back away from the wall with his Bobcat. Obviously he didn't trust his employees with the machine, and planned on doing that part himself.
I question LS's contention that the wall was raised. That would not have been repair work, but would have been a change order to the original work contract. Nobody is going to build a higher wall for free. JP, in his interview with LS, insisted on describing how the wall was built back in October, and saying he didn't have the tools to do that. Since he wasn't describing a repair job, I wonder if he even understood what they were doing there. It looks to me like CC finished the job by himself after JP and MG left.
The backfill and smoothing of the earth behind the wall was obviously done by Garrett, with their own machinery. They obviously had the machinery and I'm sure BM's friend was happy to help, as I'm sure BM offered to pay for it. At the end of any construction job, it is not at all unusual to see "punch list" items which need to be finished or corrected, actually done by others, that the sub-contractor has hired for convenience. In this case, I'm sure it was a great help to BM. I do not believe for a moment that the entire wall was torn apart and rebuilt again between the second and fourth weeks in May.
When a job like this is done, any of the major material like the block and capstones are bid directly to the general contractor. The subsequent order is at a fixed guaranteed price, for specified or approved materials. If new block or capstone was required, the general contractor (Garrett) would order the materials as a change to that supplier order. It's the traditional way to do it, but it also ensures that they get matching items. The adhesive, sand, etc for repair would not necessarily fall under that. BM could have ordered them anywhere. I'm looking at pictures that clearly show the wall got taken down and rebuilt properly, so I'm not buying into the "no materials" claim.
Basically, I see both MG and JP having very firm ideas which don't seem to me to even resemble the work to be done. Since CC and CL built the original wall, it seems like CC was the only one there who understood what BM expected. Somebody put it back together right, and it sure wasn't MG or JP.
It's all my opinion. IMO