Animations not working correctly on a secondary rig

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#1

So I was trying different sizes of the main custom character and came through a problem, the animations did not replicate correctly.
Below is a combo animation on the main character, followed by the same animation on the secondary character.



Any possible reasons for that significant change?

#2

I’ve noticed that the ‘Hands’ in the second character are not movable for some reason, might be the cause?
Everything is un-anchored but the HumanoidRootPart
EDIT: Solved by rerigging the hands with the LowerArms.

#3

Would you be able to explain how, you rigged the sword to be animated along with the arm motions.

#4

A tool, put into the character model.