In my work life I've worked for three companies that were sold to private equity and they seem to all follow the same playbook, 1) replace the top management with their own, 2) suck the cash out of the business and replace it with debt and 3) lots of outsourcing and employee terminations.
Having said that, if Highlander is in fact funding the acquisition with their own money and not borrowing to do so, this may actually benefit McIntosh as they expand. If that's the case, it wouldn't surprise me that, after the expansion is well underway that Highlander sells their interest to "cash out".
If they are smart at Highlander (and they probably are), they realize that they've snagged a jewel of a specialized company with a great future and won't gut McIntosh for short-term gain.