After a week you may have found out how to navigate in the workspace ...
No arguing, please,
just post your comments about your preferred modeler/texture/ animation tools, (i think blender has a difficult interface at first look, anyway)
Thanks!
I have found fragmotion has IK, Milkshape seems doesn't have IK,
im not sure if fragmotion's animation procedure is easy, fast ,and export to 3DGS format is free of problems.