You may well be right. I HAD thought that the New York Central showed a change in preference, toward the end of steam, for Worthington, but this was based on only two "data points" the Niagara had Worthington, and the Streamlined J3 Hudsons, originally built with Elesco, got Worthington when rebuilt non-streamlined. But with a longer view, it's hard to see any sort of trend. A quick glance at a couple of Stauffer's books reveals:
---The majority of L2 Mohawks had Elesco. (The earlier ones had the "beetle browed" mount with the feed water heater hung in front, the later ones with the feed water heater neatly recessed into the smoke box, with only the ends of the Elesco cylinder showing, as on Hudsons built with Elesco heaters. One tendency DOES show in New York Central steam designs: they really liked aesthetic elegance!)
---Most L3 and perhaps all L4 had Worthington, but some (perhaps only the Lima built L3b) had Elesco: nothing to suggest that NYC had come to a strong preference for Worthington by that time.
---J1 Hudsons were built with, as you say, Elesco, Coffin, and Worthington. No obvious pattern to the choices of Elesco or Coffin, but the Worthington heaters seem to have been used only on the last batch, the J1e.
---J2 seem all to have had Coffin, both the ten Also built and the ten Limas.
---Despite the experience with Worthington heaters on J1e, the J3 were built with Elesco.