Finally, wasn’t Peter Cushing too tall? I seem to remember him being barely taller than Carrie Fisher, and she was rather short too. He towered over nearly everyone.
^ Seems Cushing isn’t too far off Vader’s height (with Vader having a helmet and boots - and Cushing likely wearing his slippers - as the Imperial boots were apparently uncomfortable for him to film in for any length of time)…
…I can’t believe that the Empire would dismiss the stolen Death Star plans so readily in the next film. “It doesn’t matter what technical plans they’ve discovered. This station is now the ultimate power in the galaxy…” Really?! The Rebels sent their entire fleet to get those plans, don’t you think they did that for a reason?
The full conversation from that conversation in the next film is:-
INT. DEATH STAR - CONFERENCE ROOM
Eight Imperial senators and generals sit around a black
conference table. Imperial stormtroopers stand guard around
the room. Commander Tagge, a young, slimy-looking general,
is speaking.
TAGGE
Until this battle station is fully
operational we are vulnerable. The
Rebel Alliance is too well equipped.
They're more dangerous than you
realize.
The bitter Admiral Motti twists nervously in his chair.
MOTTI
Dangerous to your starfleet,
Commander, not to this battle station!
TAGGE
The Rebellion will continue to gain
a support in the Imperial Senate as
long as....
Suddenly all heads turn as Commander Tagge's speech is cut
short and the Grand Moff Tarkin, governor of the Imperial
outland regions, enters. He is followed by his powerful ally,
The Sith Lord, Darth Vader. All of the generals stand and
bow before the thin, evil-looking governor as he takes his
place at the head of the table. The Dark Lord stands behind
him.
TARKIN
The Imperial Senate will no longer
be of any concern to us. I've just
received word that the Emperor has
dissolved the council permanently.
The last remnants of the Old Republic
have been swept away.
TAGGE
That's impossible! How will the
Emperor maintain control without the
bureaucracy?
TARKIN
The regional governors now have direct
control over territories. Fear will
keep the local systems in line. Fear
of this battle station.
TAGGE
And what of the Rebellion? If the
Rebels have obtained a complete
technical readout of this station,
it is possible, however unlikely,
that they might find a weakness and
exploit it.
VADER
The plans you refer to will soon be
back in our hands.
MOTTI
Any attack made by the Rebels against
this station would be a useless
gesture, no matter what technical
data they've obtained. This station
is now the ultimate power in the
universe. I suggest we use it!
VADER
Don't be too proud of this
technological terror you've
constructed. The ability to destroy
a planet is insignificant next to
the power of the Force.
MOTTI
Don't try to frighten us with your
sorcerer's ways, Lord Vader. Your
sad devotion to that ancient religion
has not helped you conjure up the
stolen data tapes, or given you
clairvoyance enough to find the
Rebel's hidden fort...
Suddenly Motti chokes and starts to turn blue under Vader's
spell.
VADER
I find your lack of faith disturbing.
TARKIN
Enough of this! Vader, release him!
VADER
As you wish.
TARKIN
This bickering is pointless. Lord
Vader will provide us with the
location of the Rebel fortress by
the time this station is operational.
We will then crush the Rebellion
with one swift stroke.
^ So… the Empire doesn’t really dismiss the stolen plans at all… it is just Motti who is somewhat overconfident and also displays little regard for his own Imperial Fleet - whilst boasting about the power of the Death Star given the conversation above - and also resulted in Vader choking him seconds later.
Rogue One has it’s faults - many are seemingly quite subjective (and a few could possibly be explained by the re-shoots/changes) - but the height of a character and one Imperial officer in the next film with a hard-on for the Death Star becoming the basis for ‘I can’t believe that the Empire would dismiss the stolen Death Star plans so readily in the next film’, aren’t quite there.
(not discounting your premise that Motti would somehow know that it was the entire Rebel fleet at the Battle Of Scarif - which it likely wasn’t).