A thought, having worked in the "little gold dome thingy."
First off.. At the closing time for "lesser pavillions" The Land and the Universe of Energy both had moderate crowds/lines. A whole lotta people try to do Energy as their last "lesser pavillion" because the last show starts at 7pm and lasts until 7:45.
Body Wars, on the other hand, has no line. The attraction runs with a single Probe and operator to close for the night, usually Probe 2. It can run this way for several hours before the attraction closes, only moving 40 people every 5-7 minutes, and still not have a line.
During the peak periods of the day, only having two Probes (Bay 2 and 3) is often sufficient to keep the line down to 5 minutes or less. Only when the line passes the red bay (decontamination chamber 2) do they consider bringing up Probe 1 or 4 and adding those operators. There, the line is only 10-15 minutes with 1 probe operating.
On a typical day, Probe 1 and 4 are flown for "Re-staged" flights (aka: something is wrong with 2 or 3 and people have to be moved around) and on an hourly basis simply to keep them operational (the system faults and is "101" if not flown within a certain time period). Otherwise, they're not used.
Only during the busiest days (read: New Years Eve) does Body Wars with 4 operational Probes have a line that extends beyond the Blue Bay (decontamination chamber 1) and exceeds 30 minutes.
Only when Test Track breaks down (especially for weather, as Wonders is a fully enclosed pavillion) and Energy is 101 and it's a holiday, will Body Wars have a line that extends into the main ramp that wraps the building - and I have yet to ever see the expanded rope queue used unless serving as a temporary queue (think Energy 101 and weather with only 2 Probes) to avoiding having to divert people down the excessively long hard-queue ramp.
This was before SPACE opened. So, essentially to get people into the Body Wars line, you have to somehow force SPACE to be unoperational - which, like Body wars, with 4 seperate ride systems, is hard to do.