Pretty lame article. (not inferring lameness on you PROCON).
The Blue Whale weighs 181 metric tons. To an intelligent being in the Andromeda Galaxy, that’s a big alien, “here”. And what defines “intelligence”? Whales communicate with each other, is that enough? Elephants have long memories as do crow’s (its said crows can remember our facial features); two very different sized mammals.
I think there is intelligent life “out there”; but I doubt it is hulking and huge as it would be counter productive (see the people at walmart with thyroid problems, think they are going to build anything worthwhile anytime soon? Or just look at Michael Moore, proof positive of my assertion).
Even if on their home turf they’re all Jabba the Hutts, they would genetic engineer a smaller version for space travel. A 3 foot tall Grey has a LOT less mass to lug around, and needs a far, far smaller life support infrastructure!