>>42376570
I'm assuming that:
- you would like to pose these models and render them in Blender, perhaps animate them,
- you don't want to use the already existing animations from the gameloft,
- you want to do this multiple times, in other words it's not a one time thing.
If that's the case - personally - I wouldn't use a ripped rig like the one in your pics. As you said, it's difficult to work with.
IMO you should learn Rigify and re-rig it yourself. It'll take you an evening or two to get familiar with it, but once you're done you'll have rig that's easy to work with, has IK, hip bones, bone shapes and all kinds of other bells and whistles.
If you're not familiar with Rigify, the way it works is you lay down these simple reference bones like in picrel and it generates the fully featured rig for you.

When it comes to tutorials, I would recommend CGDive's videos, they are concise enough and also don't skip over the important details.
https://www.youtube.com/playlist?list=PLdcL5aF8ZcJuG3kKcVgQQz36E3JXzijEH
First three videos from that playlist should get you started and maybe the fifth one with the dog/quadruped in it. My rigs are based on the "Basic Quadruped" Rigify preset.

Also here's a blend file with my old low poly model that uses Rigify. Maybe it'll help you somehow.
https://files.catbox.moe/icy1c6.zip