Let's not be hasty
We don't have enough pixels to know for sure, but it doesn't feel like the limb's going to break under me if I give it 50/50 odds.
Consider these images of Opportunity's heatshield and backshell:
Here are the pixels from Spirit that we're wrangling over:
I see a "family resemblance" there. The shape's correct, and it's anomalously brighter than the surroundings. If I keep going I'll talk myself into raising the odds in favor even higher.