At the end of chapter 1059 we see a Marine ship heading towards egghead, as far I can remember nothing has come out of this
Now that it seems that the SHs are on their way out of egghead, the only thing I can think of is that this secret ally is the same marine who was heading towards egghead in 1059. It's either that or this marine stopped by to grab a Seraphim for other reasons.
The 2 candidates:
Fujitora
Fujitora seems to have some ties to Vegapunk and an interest in the SSG weapons. Will this be the moment where he turns on the WG? Last we saw of him was heading towards an undisclosed location.
Smoker:
Another character who may have ties to Vegapunk who has yet to appear. Last we saw of him was heading towards the lab
So far we have only seen Tashigi on G-14, for some reason Oda is choosing to hide Smoker until the last minute. Could it be because he made up his mind and decided to leave the WG with Vegapunk?

Now that it seems that the SHs are on their way out of egghead, the only thing I can think of is that this secret ally is the same marine who was heading towards egghead in 1059. It's either that or this marine stopped by to grab a Seraphim for other reasons.
The 2 candidates:
Fujitora

Fujitora seems to have some ties to Vegapunk and an interest in the SSG weapons. Will this be the moment where he turns on the WG? Last we saw of him was heading towards an undisclosed location.
Smoker:
Another character who may have ties to Vegapunk who has yet to appear. Last we saw of him was heading towards the lab

So far we have only seen Tashigi on G-14, for some reason Oda is choosing to hide Smoker until the last minute. Could it be because he made up his mind and decided to leave the WG with Vegapunk?