(How do I do quotes?)
"Highlord Amaram continued to stare at the Shardblade in the night. ... Could it be a coincidence? Two weapons that looked the same? Perhaps her memory was flawed.
No. No, she would never forget the look of that Blade. It was the one Helaran had held. And no two Blades were the same."
Words of Radiance. Chapter 52
Yes, no doubt that Shallan recognized Helaran's Shardblade correctly in Amaram's hands.
I'm only thinking (hoping) that Kaladin didn't actually kill Helaran.
I'm thinking that perhaps Amaram got his first blade via Kaladin. Then at a later point, Helaran came as an assassin, but was killed, thus giving Amaram a second blade.
We know that Kaladin killed a shardbearer in battle. And that Amaram took the Shardblade. My question is, do we know for sure that the Shardbearer that Kaladin killed was, in fact, Helaran?
And here's something else that's a little suspicious too:
Kal got Amaram his blade over a year ago. So why is Amaram saying he got his blade only four months ago? Why hasn't he been using it since the moment he made Kal a slave?