Here's the thing I don't like about how evolution is presented...
researchers also have a new guess about why the spine evolved: They suggest that the creatures might wedge themselves between the trunk of a palm tree and the base of its leaves, then use the strength and flexion of their muscular spine to force open this crevice, revealing insect larvae
Um, no. The spine did not evolve to meet the needs of the animal, the animal is alive because it had the traits needed to live. This would make much more sense if the statement was that "researchers also have a new guess about why the species thrived while others died."
The way evolution is presented by most media makes it seem like after a species goes for a few generations it gains some ability like how one can gain a power up in a video game; "Ok... humans make it to the next level... they can either run faster, see further or have faster reflexes.... what will it be?"
If this animal didn't have the ability to do what it does then it would have probably failed and we would know it now as a collection of bones in some natural history museum instead of a living creature. Now, this is also to say that those with mutations that gave them a stronger spine would be more likely to survive but it's not as if the species had control over the evolution of the spine itself.