Sachs role in sequels

[Donny]

Since they choose to rewrite the script in the 11th hour resulting in Sachs not being the Shredder afterall, I feel that they need to use the character wisely in sequels, to avoid Sachs being a unimportant figure without any bigger purpose. I liked the idea of Shredder being the big puppetmaster in the shadows, and can for that reason sort of accept that the character was not explored more in order to make him more mystical, and use that to get deeper into the character in the next movie. However, since this clearly wasn´t the original idea, I feel that the script ended up a bit scattered, and it was obvious how the movie could have been much better if they did not decide to make such a big chance rushed in the last minute, and even though I liked the guy who played Shredder and prefer the Japanese version, the movie would probably have been better with Sachs as Shredder. Therefore, I feel that they need to validate the inclusion of Sachs in the universe by develop him in the next sequel. What do you think his role will be? Do you think he will appear at all? I have two ideas for him:

1) Maybe they could use the story from the 2k3 toon, where Bishop makes a super soldier which then turns into the rat king. Shredder could make similar experiments on Sachs with the mutagen, which in the end could turn Sachs into Rat King. By doing this they can also take advantage of his established connection to Splinter.

2) Sachs could be an utrom trying to earn money to get back home to his home planet. This might be a bit trickier to do than the rat king, but utroms on the big screen would also be awesome if done right.