I expect Taft and Villanueva to be long gone before the Suns pick, simply because somebody will think they can turn them around.
If you have a team that is the lottery, you cannot afford to take a "safe" pick with limited upside. A team with five "good" players might make the playoffs, but that's about it. Free agency is great for adding to the team, but it is hard to go from zero to great through free agency. Just ask the Hawks. That means they have little choice but gamble on a guy who "might" be great someday.
For an already very good team, adding guys who can help but lack huge upside is not a bad strategy. Sometimes these "low upside" guys turn out to be very good, but they don't have to become stars if they can just contribute.
My guess is that one of the three undersized PF's will be available: Ike, Simeon, and May; because none of them look like future stars. None of them look like Suns type players, which might be to their advantage.