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The planetary formation going on in the accretion disc around HL Tau would suggest that our own system is not as strange as the 'quibblers' as you put it, would claim. Some exo-systems are weird, granted, but the accepted model for our own works pretty well, and seems to be replicated at HL Tau.
You may be 100% right, and yet based on on-going studies, it's apparent that a planet can also form through other processes. On what basis can we flatly disallow that those same processes could occur here?
Also, in the view of the exo-solar systems, the gas giants that form during the first 10 million years after star formation do so through the accretion disk model. The difference lies with how rocky planets form.
Edited 2 time(s). Last edit at 01-Nov-15 18:36 by Laird Scranton.