Size of the dragons never made any sense

I have been noticing people pointing out how Syrax hasn’t really grown in 20 year time lapse almost from season 1 to season 2. Well, none of the larger dragons actually grew really of significance. Caraxes, Meleys, Vhagar and even Seasmoke are looking the same even after so many years. Vhagar, for instance, cannot be considered since she has almost reached her end stage. But the others ?

The only dragons that actually grew any size were Sunfyre and especially Vermax. We haven’t seen Moondancer in season 1 but still can assume that she grew significantly.