Rageblade + Zeal Upgrade vs. 2 Zeal Upgrades

Phreak's recent Patch 8.6 Rundown got me thinking:

Could the new Rageblade indeed replace a second Zeal Upgrade in a generic ADC build?

Let's math it out.

TL;DR: Rageblade instead of a second Zeal Upgrade increases damage output by about 50% once Rageblade is fully stacked. Nuts! Requires Lethal Tempo, though, to fully make use of all that AS.

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The ADC I base this on is Tristana, since she is a decent benchmark. I'd like to compare four builds:

1. 
2. 
3. 
4. 

Tristana at level 18 has 106 AD, 0.656 + 25.5% AS, and Precision with Alacrity and Gathering Storm at 30 min (27% AS, 35 AD).

Assuming fully stacked Rageblade, here are Tristana's stats with each of these builds:

1. 106 + 115 AD, 0.656 + 162.5% AS, 80% at 1.5x Crit, 17.5 averaged magic damage/hit
2. 106 + 173.6 AD, 0.97088 + 157.5% AS, 50% at 1.5x Crit, 22.36 physical and 8.1 magic on-hit, 1.5 multiplier on on-hits
3. 106 + 245 AD, 0.656 + 162.5% AS, 80% at 1.5x Crit, 17.5 averaged magic damage/hit
4. 106 + 334.8 AD, 0.97088 + 157.5% AS, 50% at 1.5x Crit, 38.48 physical and 8.1 magic on-hit, 1.5 multiplier on on-hits

And here is the DPS Output, undifferentiated into damage types. Figure before the / is without Q, after with Q.

1. 867.4 / 1230.8
2. 1337.5 / 1908.8
3. 1359.9 / 1929.7
4. 2103.2 / 3001.6

As you can see, the output of builds 2 & 4 is about 50% higher than the output from the 2 Zeal item builds. And reaching ABSOLUTELY bonkers numbers, btw.