Importing Disney Infinity Character/Rig into SFM!!!

[wubba]

Hey all.. the description says it all really... I have Disney Infinity characters, with the original game skeleton intact.. I am preying I can preserve these as they contain all the facial bones for expressions/talking etc..

I was originally going to re-rig all the characters via Mixamo + facial rig & all in 3ds Max but will be 75 by the time I complete it that way.. so I figure, if i can preserve the original bones importing into SFM, half my work is done & all I have to do more or less is pose/animate.. (I hope!?)... Coming from Max, It will be a learning curve learning Blender & SFM but if successful, will save a lot of time

Please anyone with any information/tips/tutorials on how to do this much appreciated!!! I am also requesting @RScott if you can help me as I know you are pretty cluey in Blender..

In the screenshots below is my test character/rig.. I attempted to move the limbs by going into 'Pose' mode & select the hand bone to move it, though the mesh does not follow!?...
If is select the armature again, it changes back to 'Object' mode & if i go back into 'Pose' again, select the hand bone again (not the first +one that moved on its own). the mesh does follow but stretches indefinitely!?

So my initial questions are:

A) Why does the mesh not follow the bone in screenshot 1?
&
B) How can I constrain the mesh so its movement is limited to the bones intended movement capacity screenshot 2??

https://files.facepunch.com/forum/upload/277755/2f6c7615-818c-435a-af25-0a2803a61218/trooperDI-RIG-blender screnshot-1.jpg

https://files.facepunch.com/forum/upload/277755/90fe1764-d122-46f4-8db5-ddde775e8243/trooperDI-RIG-blender screenshot-2.jpg