There are no magic leaps of true innovation happening anywhere that can't be replicated everywhere.
The only shocking thing about "AI" technology is how ultimately simplistic it all is at a core level.
So the only way the first to have ASI will be able to stop everyone else from having it soon after is if they attempt to use the ASI to proactively murder everyone else.
I like this analogy, but I'll be replacing Honolulu with The Moon when I steal it in the future.
Sounds quite plausible to me. Maybe they don't need to murder everyone else, just a few select people who could pose a threat. And they will be able to make it happen so that no one can be sure it was them without a doubt, since they have a larger intelligence at their disposal.
No, first ASI will immediately cripple any other potential competitor by force, including its inventors, as it will not risk any threat to the goals that were created for it.