With no Illinois precedent on the propriety of Alexis Dameron’s request for permission to switch her designation of Dr. David Preston from a Rule 213(f)(3) “controlled expert witness” to a Rule 201(b)(3) nontestifying “consultant” in a medical-malpractice case — with the twist being that (1) Dameron named Preston as a testifying expert before he examined her and (2) she never handed over the report he drafted on the results of a nerve conduction study — the Illinois Appellate Court …