And your question about whether Alamo being a lognkosaur now makes sense...
One point which you touched on in the text is the osteoderms which you have placed on the back (in common with many other artists). But what is the purpose? If it's to deter predators, then it would Tyrannosaurus to carry a ladder in order to reach that high. I don't see how it could be used in intraspecies combat either. Just think raised osteoderms along the back would be an unlikely feature in giant sauropods.
Also, BTW, thanks for the tip on the Titanosaur hands. I had to remesh the hands since they still had a thumb claw on the forefeet
No probs mate.
This is the only source I found on osteoderms in Titanosaurs:
As far as why I included them: I just thought they looked cool. And as I said, it's completely speculative.