Let's not make a "federal case" out of this...

One board member's friend bidding doesn't mean much. I am of the opinion of the situation being "Hey you have a lawncare company and we are taking bids on the contract in our HOA. Would you like to bid? Here is the price range we are looking for and the terms. You think you can beat it then offer that in your bid. I can't guarantee you get my vote, but you will be considered with the best 3 bidders for the contract".
Any contractor knows that lowest bid does not win and even having an "in" doesn't make it happen. No matter how much "inside" information one may get. There are still other board members and members to weigh in on the vote. One board member vote and one that they may even excuse themselves from doesn't add up to much.
The proper bidding process eliminates the "friend in" deal. We always took bids from anyone even if we knew them, related to them, or even was a member. We were up front about the 3 bid process and no guarantees made. The only advantage they truly got was knowing there was a contract open to be bid on and knowing what we paid out. If they were a member, they should already have access to knowing that information.
I got rid of a lawncare person in our HOA that lived in our HOA and mowed our lawns for 5 years. He was the former president's drug supplier and was a HOA member. Everyone knew the guy. There was just so many complaints whispered in my ear that I made his contract open with him getting first bid as the incumbent. So that can prove that even someone with the contract, a member, friends of the board (including myself), and lowest bidder can lose the bid.