LMPD exists apart from the Sheriff because that's what the Metro Council and their predecessors wanted to do. Aubrey can't take LMPD over unless the Metro Council gives it to him. The Sheriff is legally considered the more senior law enforcement officer above the Chief, but that wouldn't extend to taking over LMPD as an organization without an ordinance being passed. JCSO only has about 240 regular deputies and 100 reserve deputies because they don't get the funding from the Metro Council that LMPD