The question of, "Can a Lalafell be as strong as a Roe?" is dependent on the Lalafell and the Roe you're comparing. The strongest Lalafell might not be able to physically best the strongest Roegadyn, but a strong Lalafell could probably stand toe-to-toe with an average Roegadyn. (Assuming an average Roe already has crazy strength)
I only skimmed the thread (sorry!) so I'm not sure if it's already been mentioned, but there are little people, people with dwarfism, who bodybuild and are capable of some pretty impressive feats. Bodybuilders like Mighty Mike or Jason Owen can bench over 300 lbs. Vince Brasco stands at 4' tall and can bench 285. As someone who RPs a physically strong Lalafell, these were people I looked at to get a good measure of what was possible. The potential is there to have strong Lalafells without assuming 'fantasy' or 'anime' physics.
I only skimmed the thread (sorry!) so I'm not sure if it's already been mentioned, but there are little people, people with dwarfism, who bodybuild and are capable of some pretty impressive feats. Bodybuilders like Mighty Mike or Jason Owen can bench over 300 lbs. Vince Brasco stands at 4' tall and can bench 285. As someone who RPs a physically strong Lalafell, these were people I looked at to get a good measure of what was possible. The potential is there to have strong Lalafells without assuming 'fantasy' or 'anime' physics.