Crab ID?

Hello! Marine bio master’s student here who likes crabs a bit too much. Was handed this molt by a friend who found it drying in the sun all day. I believe it’s a hemigrapsus sanguineus/asian shore crab, but as far as I know those crabs has 3 teeth on either side of the carapace while I only see 2 for this little guy. Is it because it’s a molt that the 3rd tooth isn’t visible? The claws also look much smaller than a regular male. Is it a juvenile? Just wanted to double check!

Found in Bocas del Toro, Panama.