Based on what exactly? Both myself and several members of the organization have both been on the record saying Ortio looked fantastic during the prospect camp. I honestly liked him best out of all the goalies there..
In general, I'm not really sold on Calgary's goaltending prospects. They're numerous but not stellar.
Outside of MacDonald, here's how I'd rank them optimistically.
Ramo (Average NHL starter potential, ready to step into that role)
Gillies (Good NHL starter potential, not enough experience to step into the role, needs more time developing)
Berra (Old enough with experience to step into NHL, 1B / 2A role at best)
Ortio (2A or great AHL starter)
Broissoit (2B or good AHL starter)
Outside of stats, a lot of it just has to do with the teams they played on and watching their games and reading their recaps. I follow Gillies and Broissoit closest, and Ortio at the international level. Personally speaking, I value goaltenders who shine on poor teams over good/stacked teams in their respective leagues, and experience over potential in terms of development (example, making national teams and the like.)
I did not attend the prospect camp so I will not argue against what you saw there, but one good camp does not make a career.
Either of us could be wrong, I'm just not as high on him as others. I used to be, but Ortio took a step backwards a couple of seasons ago and I haven't heard much about his "recovery" to getting back on track.
Don't take it personally being on the record and all - it's just how I view it.