Buy 2 missing deathless pieces or use units for epoch

Im missing 2 deathless KG pieces. Should I buy them for 10k units and do the final deathless run? Or just use the units for epoch and wait until there is another way to get deathless pieces?
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I suggest you buy the pieces and meanwhile farm revives to complete epoch.
Getting Thanos is easy if you have all the others deathless, but i will complete epoch before doing the deathless run.
10k units for 7r4 Gem, loads of 7* crystals, loads of 1-2 gem, 7r3 generic gem, 7* sigs, 7* Awaken class and generic gem, Titan, Titan Nexus, 7* Penta-Nexus crystal, T7B and T4A
Unbelievable rewards.
You will be able to get deathless through units, or eventually another way that's tbd right now, but it will be in the future.
At two pieces it's gets too expensive and not worth it.
That's just how I see it.
I'm missing 2 KG and 1 Guilly peice in my alt.
Not bothering buying them.