Who gives a shit about them they failed to hold kaido 18 times why would now be different.
The WG never actually wanted to kill Kaido that's obvious as fuck.
He was their lab rat for a reason.
Here's how it went.
-Young Kaido gets captured
-Gets put to death by fodders
-Execution fails
-Fodders try 17 other methods
-It catches the attention of WG higher-ups
-They send him to Vegapunk so he could do his stuff
If the WG wanted him dead they'd have fed him another DF and be done with it, his body would've exploded.