Nor did Voyager have a superior science officer, (maybe they were killed by the caretaker).
If Voyager had someone like Mr. Spock, he would have created short cuts to get the array ready to send them back sooner, they would have been back to the alpha quad at the end of the pilot.
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Voyager really didn't need one. Janeway herself was on the science track before switching to command so she kinda fulfilled both roles, though essentially Seven filled most of the role later. TNG didn't really have one either, the closest we got was Beverly.
While they didn't have an official "Chief Senior Officer" on the senior staff, there was probably someone aboard who was responsible for all of those working in the science labs.