I believe I said the 5DSR is not the equal of other options. Did I say "all others"? Correct me if I am wrong.Where did the data in that Table come from? And have you interpreted the data correctly?
1. The 5DSR has the same battery as the 7DII and 5DIV, so they also have the same voltage limitations as the 5DSR for driving AF servos.
2. The table has the AF accuracy of the 5DSR better than that of the 7DII in all cases, contradicting your statement that the AF of the 5DSR is not the equal of the others.
3. Slow frame rate certainly does not imply considerable shutter lag - the slow frame rate for the 5DSR results from slow data transfer after image capture, not lag before capture. Imaging resources has measured the shutter lags of the of those cameras, and those of the 5DSR are very close to those for the 7DII: full AF wide/mid is 0.25s for the 7DII and 0.27s for the 5DSR, and for prefocussed (the usual case for BIF), 0.052 and 0.057s respectively.
So, the numbers you have presented don't support your arguments and according to your logic show that the 5DSR is better for BIF than the 7DII.
As to voltage, the 7D2 and 5D4 can boost the voltage internally which allows them to drive the ultra-sonic servo motor of the lens a bit faster. The 5d3 and 5DSR do not have this capability. The 1DX2 uses a larger capacity Li-ion pack to drive the len's servo quicker than other Canon bodies.
I own a 7D2 but rarely use it for BIF as it has a dated AF and poor ISO performance. But I would choose the 7d2 over my 5DSR for BIF in some circumstances because it has advantages such as superior FR and buffer.
The 5D4 and 1DX2 are much better choices than the 5DSR or the 7D2 for BIF. Shutter lag exists with all cameras but is an important consideration when shooting in AI-servo. Cameras with more shutter lag make it more difficult for the camera to accurately predict focus when shooting fast moving subjects. The Gen3 AF module and software found in the 5D4 and 1DX2 do a much better job of predictive focusing in AI-servo....aided by less shutter lag.
Comparisons between the dated 7D2 and the 5DSR is a little fruitless. Better camera options than the 5DSR are provided by Canon.
The 5DSR has a older generation AF, very slow FR and a small buffer. It does not drive the AF servos of super tele lenses as quickly as the 5D4 or 1DX2. It does not handle tele-converters well and lacks the cross type AF points of the 5D4 or 1DX2.
To each his own but I do not want to miss capturing the critical, split second pose of a BIF because of a slow FR, small buffer or dated AF.