All the helmets in the picture are aero helmets, just different styles.
Helmet needs in sprint competitions are different than for individual timed events as the rider is more likely to turn their head around to assess the race situation as well as be in various positions on the bike (e.g. out of the saddle while accelerating) which means the interaction of the helmet and body for air flow is more variable and needs to be a compromise for this more variable situation. For this reason a more uniform spherical like shape has become common.
Nevertheless, depending on the rider, some helmets are a better aero choice than others. It is individual and no single helmet is universally the best aerodynamically. I regularly test helmet aerodynamics for riders and am constantly surprised by the results.
Hoy quite possibly doesn't turn his head as much as he has tended to race like a human derny.
For national level track riders, don't assume all have tested these things. That level of attention to detail isn't as common as some are led to believe.
For road professionals keep in mind they mostly ride sponsor's equipment whether or not it is aerodynamically superior or inferior.