I believe the nem in the first picture has about a 50% chance of being a magnifica, mostly because you said it was huge and the color of the pedal column. If it is a BTA it will likely be just fine as it still has its color, tentacle length looks ok and the foot doesn't appear to be sagging. I would also say that pulling him off the rock to move him into more light was the wrong move, this is stressful on the nem and BTA aren't exactly high light nems. Furthermore, deflating would be an atypical symptom of too little lighting when there is no color loss.
Cpike, while your nem exhibits normal behavior in the first picture it is not a fully healthy specimen. The translucence in the oral disc is a sign of bleaching, the striations seen on the oral disc are the inner workings of the nem and would not be seen on a thriving nem. The tips of the nem are also atypical and uneven in length and distribution in a manner that does not appear to be due to flow, this also suggests bleaching as BTA will consume portions of their tentacles in instances where they are unable to obtain enough energy from photosynthesis. However, all that said it is not in bad shape either and likely is on the mend in that picture or had just recently experienced the event that lead to it losing some of it's zooaxnthelle.
As for the second pic, while it is far from being on deaths doorstep, it is not close to being healthy either. BTA "walk" by inflating a part of their foot and deflating the other slowly moving it along behind or by completely detaching puffing up the foot and pulling the tentacles in and floating. In this picture we see a nem that is attempting to attach to a surface and failing. A healthy BTA can attach to a surface within seconds and would keep the oral disc buoyant to aid in attachment. The one in the pic is sagging and has maybe half of the foot attached and in an uneven pattern. It is also attempting to hold on using it's verrucae (bumps seen on under side of nems that aids in orienting the oral disc by attaching to surfaces) which is not a good sign as it indicates it is struggling to keep its foot attached because the foot is weak and it is not trying to move.
Not trying to rip anyone here, just attempting to point out the difference in a BTA that is healthy and one that is not. Survival and recovery are different than a healthy thriving one. To the original poster, if you have a pic of it healthy it would be very beneficial to get a 100% ID because how you proceed will be very different. If it's a BTA you can simply correct whatever issue is causing it to struggle and give it time to recover. If it is a magnifica, it will be dead in a matter of days without treatment and this is not being dramatic it is a documented fact.