What If: The three Dirk upgrades were made 'exclusive' and somewhat more specialized?

Serrated Dirk

Long Sword x2 (700) + 400 = 1100

+20 Attack Damage

Unique Passive - Brutalizer: +15 Lethality Unique Passive - Seeker: +20 Out-of-Combat Movement Speed

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Youmuu's Ghostblade

Serrated Dirk (1100) + Caulfield's Warhammer (1100) + 800 = 3000

+50 Attack Damage +10% Cooldown Reduction

Unique Passive - Brutalizer: +25 Lethality Unique Passive - Seeker: +35 Out-of-Combat Movement Speed

Unique Active: For the next 6 seconds, ignore unit collision and gain +20% Movement Speed (45 second CD).

The mobility-focused Dirk upgrade. Grants the most out-of-combat movement speed, in addition to its active. I'm surprised the active doesn't already let you ignore unit collision, honestly. It is a GHOSTblade...

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Duskblade of Draktharr

B.F. Sword (1300) + Serrated Dirk (1100) + 700 = 3100

+60 Attack Damage

Unique Passive - Brutalizer: +30 Lethality Unique Passive - Seeker: +25 Out-of-Combat Movement Speed

Unique Passive - Nightstalker: After being unseen for at least 1.5 seconds, gain +10 additional Lethality. This bonus Lethality persists for 2.5 seconds upon entering combat with an enemy champion, then the item goes on a short cooldown (15-5 seconds based on user's Level).

The power-focused Dirk upgrade. Grants the least out-of-combat MS of the upgrades, but has the most AD and innate Lethality, while also gaining even more Lethality for assassinations.

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Edge of Night

Serrated Dirk (1100) + Jaurim's Fist (1200) + 600 = 2900

+300 Health +40 Attack Damage

Unique Passive - Brutalizer: +20 Lethality Unique Passive - Seeker: +25 Out-of-Combat Movement Speed

Unique Active: Channel for 1.5 seconds to gain a spell shield that blocks the next enemy ability within 5 seconds (60 second CD). You may move while channeling, but taking damage will interrupt the channel. If the channel is interrupted, the item is put on a reduced 5 second cooldown.

The durability-inclined Dirk upgrade. Has the least killing power of the upgrades by a significant margin, but trades it for some Health and the spell-shielding active.

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Not perfect, just something I threw together to get the idea out there.