First off, Samuel de Champlain never described Champ, he spoke of a monstrous fish that was most likely a large gar. The name he used was like the native name for the Long-nosed gar in the region, but he gave the dimensions of an Alligator gar. Since in either event this giant gar has become extinct more recently, it is probably a moot point as to which species the fish originally belonged to.
Now Id like to reproduce two sections off of Thomas Finlay's work, but only the second one is what the discussion shall be about:
And the bottom which has the reconstructions. The scientific name is irrelevant and means nothing. It presupposes an unproven and I think highly unlikely relationship for the creature.
The pointed fin on the back of the one model obviously corresponds to the hump on the back of the other creature model, and in the majority of the reports this is referred to as a hump.
In comparing the two versions of Champ it is obvious that one has a much larger head than the other and in fact this corresponds to certain reported creatures from Lake Champlain that have fairly big, horse-shaped heads (Indicated by the inset below) this corresponds to a series of reports which are distinguished not only by having large heads with horselike freatures (Including the typical placement of the eyes far back and near the top of the head, and the nostrils at the tip of the blunted snout which dialate to a large size, but also noticeable ears at the back of the head, and an overall coating of rough shaggy hairs, which can include the mane. Typically the neck is thickish and not especially long , and in such cases as David Miller's sighting off of British Columbia, there is a good cause for assuming the scale and distance have been misjudged (I the Miller case, going by the scale the creatures's head is six feet long and three feet thick going by the scale, which are figures that contradict most of the similar sightings by a wide margin)Since several such sightings on Lake Champlain even include Moose antlers, it would seem these sightings ordinarily refer to swimming moose. The Olsen videotape at Lake Champlain is evidently one of these and the shape of the head does appear to indicate antlers with the head turning at different angles and thus "Changing shape" (in the bad focus)
It is important to emphasize that the various reconstructions done by Sanderson, Dinsdale, myself and the other were all done separately and yet they all match up pretty closely: and these composites were variously done for Sea Serpents in general, Loch Ness, Caddy, the Patagonian Plesiosaurs and Australian Longneck sightings each separately and yet they alll match up very closely. I consider that Thomas Finley's reconstructions for Champ show the same general agreement, allowing for the fact that the reports are also becoming more precise over time and so the older reports are less accurate than the newer ones are.