Up for some speculation?
Shanks is Imu and is the finak villain
1. Both have a penchant for maintaining the balance of the world
2. Both have keen interest in two D clan members Luffy and Blackbeard
3. Both use similar swords
4. Both have/had a straw hat
5. Shanks has undue influence on WG
6. Im is the name of a giant from norse mythology. Shanks has connections to norse mythology
Now let me debunk this
We have only seen Imu using 1 hand (left) in every manga panel. However, Shanks only has right hand. So, unless some deeper subversion is going on this can’t be true
If Shanks is Imu or somehow related to Imu, he has only helped to bring Luffy this far as he may want to get One Piece to retrieve One Piece you need Joy Boy.
Shanks is Imu and is the finak villain
1. Both have a penchant for maintaining the balance of the world
2. Both have keen interest in two D clan members Luffy and Blackbeard
3. Both use similar swords
4. Both have/had a straw hat
5. Shanks has undue influence on WG
6. Im is the name of a giant from norse mythology. Shanks has connections to norse mythology
Now let me debunk this
We have only seen Imu using 1 hand (left) in every manga panel. However, Shanks only has right hand. So, unless some deeper subversion is going on this can’t be true
If Shanks is Imu or somehow related to Imu, he has only helped to bring Luffy this far as he may want to get One Piece to retrieve One Piece you need Joy Boy.

