Isuzu Repair: 1990 Isuzu clutch failure, clutch pedal, shift linkage

Question
Help!  I have a '90 Trooper.  I went to drive this truck after a long period of non-use (son who uses the truck is away at school) and had no clutch.  The pedal went limp to the floor and the clutch does not engage.  I noticed a small amount of leakage around the slave cylinder, none around the M/C or clutch pedal.  I replaced the S/C and bled the system.  Still no clutch!  A friend suggested that the pressure plate may be fused to the flywheel - stuck from sitting so long.  He suggested that I drive the truck in 2nd gear for a while and see if it would pop loose.  I did this for a couple of miles, but no clutch still....  I got under the truck (up on jacks) and manualy moved the little tab the S/C should move back and forth and there seems to be no actuation of the clutch.  when the pedal is pressed (by a helper) the piston does not seem to move very much.  The only thing that has improved through all my efforts is the the pedal while still limp... no pressure.... does return to the up position.  What am I missing?

Answer
It could be anything from a damaged striking rod, release bearing, Jammed gear/s. Also contaminated fluid and or air in the system. Worn shift linkage and or input/output bearing damaged or scoured. If this doesn't help you at all Jerry let me know okay?