I agree, there is much variation (within a kind) in the real world. However, I wouldn't call these variations "transitional" into another kind.
It's not a matter of simple variation, which can occur randomly within any contemporary population, but rather of those variations, to use the term, occurring within specific time periods. When you examine those variations within a chronological timeframe, as TD has lined up the skulls, then the transitional significance of those variations becomes clear, particularly when considered against the backdrop of geological and climatological patterns. In fact, that's how evolution works. Random variations take on "good" or "bad" significance only in view of the prevailing environmental pressures and can come to dominate a population when they convey some benefit, even if very small.
However, you added a very good point, and that is that the WT view of creationism isn't the only view out there. Toward the end of the transitional fossils essay that I linked to, the writer (whose name escapes me, aggh) discusses something like five different creation scenarios and how each does or does not harmonize with the fossil record. Pretty interesting--the WT likes to make out that you're either a creationist or an athiest, and nothing could be further from the truth.
I want to add more but gotta run!!