They aren't necessarily too big for the WBL (big, yes, but outside of basketball they'd just be the new Kenton, bringing up the rear in everything.)
They've just burned every bridge with the other Lima area schools and bring zero fans. I'd argue their demographics don't help either. The WBL would likely roll with 9 or find a way to get to 8 rather than ever consider Senior.
Closer conference....no, not really. They're equal distance between Toledo and Dayton, so the only other leagues that could even conceivably work are the MVL or the GWOC. And consider both of those leagues said thanks but no thanks to Trotwood who is probably the closest comparable to Lima....they aren't happening.
Their only choices were the TCL, a football scheduling alliance with the NLL, or total independence. This is a nice landing spot for them.