KNS: #2, Tampa 4th Friday

Ok I need to be educated.
I have just watched the replay.

Coming into the 2nd turn and then into the 2nd turn the 7 horse cleared KNS who was rail all the way. Daylight was present to the outside but then closed. imo there was plenty of time to leave the rail but KNS stayed...

Help me here?

I know we of course like to save ground but the horse a ton left. No move to the outside on the turn because it was likely horses would tire and an opening was certain to occur?

So much left is the only reason I am asking.

Help me here. Not meaning to 2nd guess, just need some reasoning.
I thought the trip was great and when I watched the replay I was thinking there is the opening... perfect timing... but "we" stayed rail. Then of course it got very tough after that. But a wonderful finish.