[Windflier]

If they couldn’t lift themselves then how did the come into being? Why would they even exist and how did they get to the size we assume them to have been?

The obvious logical conclusion is that our planet's gravity was much weaker in the time of the dinosaurs.

That sounds like heresy, but the fact is, these animals once existed. They could not exist in our world today, ergo, their world was fundamentally different from ours, gravitationally.

It says to me that we humans have not yet unlocked all the mysteries of our universe.

[Manly Warrior]

Do you realize how silly that sounds? Gravity was weaker?
Evolutionists need to be consistent, either things constantly vary or they don’t. Fitting the facts to the narrative is very disenguous.
Maybe days were longer, or maybe shorter, maybe there was lower or higher air pressure, 220,221, whatever it takes.
Maybe just better left said “we don’t know” rather than constantly mix and match theories that do not support one another.