yes, mate,

I too backed Ziti, but the only factor which diminished it's performance was the ride of the apprentice, who, let's face it, did not have the strength to "drive" the horse hard to the line. I've studied this race and with a more senior rider the horse may have finished much closer(imo).
What you were talking about was that, previously, it had run in a restricted race only open to E&G(entires & geldings), whereas this race was open to fillies, mares and all male contenders.
Classwise, I refer you to another post which outlines such class differentials.
Barrier trials, forget about it....there is no compunction here for trainers and riders to show too much in relation to their prospects. Just treat them as "glorified hit-outs," meaning....take them as you see/assess them.
Also, here in Oz, betting is a very significant factor in assessing the prospects of a runner in today's races. Look for the overnight shortener to give you a "leg-up" as to it's prospects for this day's racing.

Cheers.