Alan got it right (why wouldn't he) - if only one wheel has traction, only at that wheel torque will be created.
If all 4 wheels had equal traction, then 1/4 of the maximum torque can be created at each wheel.
The amount of torque at only one wheel with traction, depends on the amount of traction at that wheel.
100% of possible torque at one wheel is very unlikely. Maybe on coarse granite with a lot of weight pressing the tire down.
100% of torque at wheel is not desirable. A lot less is needed to move the car. And 100% is a tremendous breaking force. G axles are designed to withstand that tremendous force - Jeep axles are not.
Torque needs to be "created". The "potential" torque needs a counter force to create torque. A counterforce in form of resistance like traction. The amount of resistance determines how much torque can be created (up to the maximum the gear train is able to deliver).
If you have a potential torque of 1,000 units and the traction at all 4 wheels is greater than 250 units, a maximum of 250 units of torque per wheel can be created. If one of the wheels is on slippery ground (3 open diffs) and has only 100 units of traction, that tire would break lose and slip as you increase the gas to more than 400 units of torque (100 at that tire). If your car would need a minimum of 500 units of torque to move, you would be stuck, because you are creating only 400 units. So, even the 3 wheels not moving are getting 100 units of torque each. It's a rule in mechanics that with open differentials all wheels get equal torque. Always.
If you so will, open differentials act like safety valves - no wheel can get more torque than the wheel with the least traction. That way no excessive torque is ever created - which could twist/break some vital parts.
Once you disable the differentials (diff locks disable the differentials) the wheel with the most resistance/traction will have the most torque. That way you can create the amount of torque needed to move the car. But since now the total torque is handled by either 3, 2 or one wheel(s), one has to be very very gentle on the throttle. #1 - those tires with traction could easily overpower the traction and start slipping as well, #2 with super traction on the remaining wheels, any amount of torque higher than needed to move the car will go into twisting components. Just ask the Jeep guys or check youtube.com.
Baby talk like "power goes to the wheel with the least resistance" is just that - baby talk. Or forum talk.
Power does not move the car. Torque does.
Sorry for the rant - 4x4 stuff is not easily explained. And there is no short version.