Joe, there is a difference between speculation firmly rooted in canon, with evidence and logic behind it, and saying "I don't like blue, so the sky is red in my world."
Actually, I take canonical events and then theorize stuff around them. We kicked this one off with Dunkelzahn used thread magic (the power being the title of President of the UCAS) to power up his spell.
He's a Dragon. Check.
He became President. Check.
He waited until after becoming president to cast the spell. Check.
Now, I'll give you that I don't know for sure that Dunkelzahn didn't have a "Tear Hole in Reality" spell usable at will, but I like to think he needed some extra boost.
Now, using Earthdawn.
Dragons are Namegivers. Check.
Dragons can use thread magic. Check.
Thread magic can boost the skills and abilities of people, places and things. Check with an asterisk. Thread magic is complicated. You can boost the attributes of the target, or you can boost your own abilities when dealing with the target. The direct path would involve the Title of President of the UCAS is a person, separate from the actual person holding the title. Dunk could weave to the President, which coincidentally happened to be himself. That's a little sketchy rules wise, so the other route would be a place (the UCAS), which requires a key knowledge and pattern item associated with being the President. Or it could be a magic item that required a deed of being the president. Regardless, thread magic is within the knowledge base of any surviving 4th worlder.
Thread magic requires a pattern item. Dunkelzahn had a long list of items that he gave away in his Will. At least 1 was a pattern item (the rose/flower?). It is reasonable that he could have found the relevant pattern item. Check.
Now, you could say that Earthdawn and Shadowrun are different intellectual properties, held by two different companies, however, at the time of spellcasting, both were still held by FASA and Dunkelzahn's Will was an attempt to codify the two properties together. So 4th World magic, check.
Where exactly do I say the sky is anything but blue?