WKTB has had full-power standard definition simulcasts on WPXA, and now WSB because the range of the WKTB signal is anemic. But important here; they do have an existing news operation which has done well in the awards department, so Gray is smart to snap them up at that price and give them a true HD simulcast in the market, along with a local ad agency targeting minority audiences, so it's more a $15/$15 million deal for both items, not overpaying for a station on autopilot without local deviation (and which has had solid local ownership before this point willing to pay for subchannel simulcast deals to better the hand they've been dealt).
Of additional note...this WGCL news share deal made with Univsion's WUVG in 2017 will likely come to an end, suggesting that it's possible the WKTB buy-out came as a result of the new TelevisaUnivision deciding to put actual resources into the WUVG news department and kill the Meredith agreement.