Even after Russell's study, various researchers have found reasons to lump some or all of these species back into "Ornithomimus" in various combinations. In 2004, Peter Makovicky, Yoshitsugu Kobayashi and Phil Currie studied Russell's 1972 proportional statistics to re-analyze ornithomimid relationships in light of new specimens. They concluded that there was no justification to separate "Dromiceiomimus" from "Ornithomimus", sinking "Dromiceiomimus" as a synonym of "O. edmontonicus". However, they did not include the type species of "Ornithomimus", "O. velox", in this analysis. The same team further supported the synonymy between "Dromiceiomimus" and "O. edmontonicus" in a 2006 lecture at the Society of Vertebrate Paleontology annual meeting, and their opinion has been followed by most later authors. Makovicky's team also considered "Dromiceiomimus samueli" to be a junior synonym of "O. edmontonicus", though Longrich later suggested it may belong to a distinct, unnamed species from the Dinosaur Park Formation which have yet to be described. Longrich called the species "Ornithomimus samueli" in a faunal list for the Dinosaur Park Formation.