Kazuaki Shimazaki wrote:
There is no such thing as a "perfect" cloak, unless you want to bake yourself in one.
Geordi's words, not mine (hence the quotation marks

).
While you're right, certainly, we can say
Scimitar's cloak is
effectively perfect against Starfleet sensors.
That would depend on whether the Galaxy and Nebula's sensors cover different bands, or are just of greater sensitivity and power, or simply not superior at all.
If the Sovereign really has the best sensors in the fleet, then of course nobody else in Starfleet could. However, I would hazard that a dedicated "Nebula AWACS" might have superior sensors.
If they cover different bands, it is impossible for Riker to be absolutely sure, since he's evaluating the cloak from the data available from the Sovereign sensors. It is like a radar operator conluding a plane to be invisible to IR, simply because he can't pick it up on his radar.
So, basically,
assuming certain unknowns are taken as facts, Riker
could be wrong?
I mean, really: with the paltry data we have, could we reasonably compare GCSs' and NCSs' sensors to a
Sovereign's?
Looking at the shows, how would we come to understand that a GCS's sensors cover bands a
Sovereign's don't, that a NCS's sensors are the most sensitive and/or most powerful in Starfleet, etc., etc.?
We need a hard reason to discount Riker's statement. We need reason to believe the
Nebula's powerful suite would succeed when Riker clearly says
Scimitar could pass by all of Starfleet undetected.
If they are of greater sensitivity and power, but in the same band, then it is possible to estimate how much better they would do. We know the Scimitar is invisible to the Sovereign even at 1km or less. Let's take 1km. If we assume that a Nebula AWACS has sensors 100 times better (say by putting 10 times more power into the active scan and using sheer antenna size to get 10 times better sensitivity.) Then, according to the Inverse Square Law, the sensor would still not pick up the Scimitar until it is under 10km. In space terms, that might as well be invisible.
Especially in *Trek* space terms
The latter part is especially nicely stated, but again, without something more cut and dry, I see no reason whatsoever to declare Riker wrong. There are possible ways in which he (and Geordi)
could be wrong, but let's not pretend otherwise: those possibilities are
very big unknowns.