I'm not an expert in the slightest, so I could be wrong. But isn't the SA-1 manned by a lot of people? I've read it's capable of engaging a large number of targets at once. It could be out of the ability of a single person to operate.
The Berkut (SA-1) could fight 20 targets parallel.
It had 4 guidance stations manned by 2 officers each, and one station could handle 5 targets.
[At the S-300PS (SA-10B) system, two officer could handle 6 targets.]
