warranted “by considerations of ‘proper constitutional adjudication,’ ‘regard for federal-state relations,’ or ‘wise judicial administration.’” Quackenbush v. Allstate Ins. Co., 517 U.S. 706, 716 (1996) (quoting Colorado River, 424 U.S. at 817). The Sixth Circuit has identified two prerequisites for abstention under this doctrine. Romine v. Compuserve Corp., 160 F.3d 337, 339-40 (6th Cir. 1998).
First, the court must determine that the concurrent state and federal actions are parallel. Id. at 339. Second, the court must consider the factors outlined by the Supreme Court in Colorado River and subsequent cases:
(1) whether the state court has assumed jurisdiction over any res or property; (2) whether the federal forum is less convenient to the parties; (3) avoidance of piecemeal litigation; … (4) the order in which jurisdiction was obtained; … (5) whether the source of governing law is state or federal; (6) the adequacy of the state court action to protect the federal plaintiff’s rights; (7) the relative progress of the state and federal proceedings; and (8) the presence or absence of concurrent jurisdiction.
Romine, 160 F.3d at 340-41 (internal citations omitted). “These factors, however, do not comprise a mechanical checklist. Rather, they require ‘a careful balancing of the important factors as they apply in a give[n] case’ depending on the particular facts at hand.” Id. (quoting Moses H. Cone Mem’l Hosp. v. Mercury Constr. Corp., 460 U.S. 1, 16 (1983)).
As summarized in Defendants’ response brief and reflected in their exhibits (see ECF No. 31 at Pg ID 2193-97; see also ECF Nos. 31-7, 31-9, 31-11, 31-12,
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