I've skipped using Irish moss once and ended up with a cloudy bitter. That was also my first, and only, use of gelatin to try to drop some haze. But I do often cut back on the amount of IM and it still seems to work.
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How old is the yeast?
When used in primary fermentation, brett needs to be treated as you would sacch. or it won't attenuate. Adequate pitching, aeration, temp. control.
Did this brewer top off with water before the boil or brew the batch to a higher gravity?
you could also make an argument for sparging and sparging and sparging, then boiling and boiling and boiling to increase overall efficiency. boiling a lot and down may increase malt flavor at a higher overall efficiency.