None of your suggestions are even canon in the films at all. A failed toy line and overgrown fuzzy toys don’t count, especially in a game concerning dinosaurs.
The op said which unseen dinosaurs from the films, which is not the same thing as any of the game-killing things you suggested.
(I don’t care which decade they’re from, “Chaos Effect” nearly killed the entire franchise for good. Keep in mind that this was at a time when JP 3 had damaged the series at the box office, and Fox Kids had already failed to produce an animated JP series. Chaos Effect nearly finished the job that the first two had started. Out of eight toys planned, only four saw the light of day before Kenner axed that line for good. And no, the “Ultimasaurus” was never sold in stores, even if it was printed on the boxes. What you’re seeing on the internet is a widely recycled photo of a Kenner toy prototype, not an actual toy.)
And the forum has repeatedly blown both ideas out of the water, especially the fuzzy mammals. They aren’t wanted.