Live Geograpsus Hawaii - could it be the extinct G. severnsi?

Almost a year ago i stumbled apon a weird grapsidae crab from the coast of Big island, Hawai'i. At that point in my crab identifying journey I had known most of the grapsoidea (except for genus Percnon, which i constantly fail to identify properly) and all of the extant grapsidae of the islands.

Grapsus tenuicrustratus, or the thin shelled rock crab is the largest of them. It has long, spidery legs with a carapace that reaches 3" in length. It is the most common grapsidae of Hawaii and is called "a'ama" by locals

The other grapsidae are tiny in carapace size.

However I was stumped. This crab was large but did not look like G. tenuicrustratus The carapace shape was oddly circular, and the eyes were strangely close together. The photo angle was quite hard to work with, but it really did remind me of the extant Geograpsus grayi and the Geograpsus lividus that I would identify from nearby regions in the Pacific.

Photo of live Geograpsus lividus from Costa Rica. Smooth chelae with small granules, hairy long legs and a smaller rostrum are characteristics of the genus. Photo credit @vilseskog on iNaturalist

Photo of the live Geograpsus from Big Island Hawaii, photo credit @mlindgren on iNaturalist

After other users had agreed that this was some sort of Geograpsus, we began to think about only known Geograpsus from Hawaii - G. severnsi. G. severnsi was thought to be extinct right after the first ice age. Despite being a member of Grapsidae (the shore crabs) it's semiterrestrial behavior was that of a similar family Gecarcinidae (the land crabs) as it may have been found miles from the coast. After discussion between the observer of the crab and crab experts , the observer went out again in attempt to catch the crab. Photos of the dactylus and other parts of the chelae would be essential to keying this species out to G. severnsi , as the only left remnents of G. servensi are those exact parts. Unfortunately , the user wasn't able to catch the crab.

Even more surprising, a similar ob of a Geograpsus sensu stricto was observed a couple days. The photo was of lesser quality, but at that angle, it was pretty clear that it belonged to Geograpsus. Here's the observation of the second crab https://www.inaturalist.org/observations/257496491

A year later, this crab still has me stumped. What started as just a 'regular' crab photo somehow turned into something much bigger, showing how even small, everyday observations can lead to surprising discoveries.