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That's not really the case. Rassilon and Omega created the Eye of Harmony and the Hand of Omega and undertook the original time travel experiments. TARDISes are a direct result of that technology, but it's unclear if Rassilon and Omega created the concept of the TARDISes themselves (some fans have speculated that they originally used things more akin to the SIDRATs, much more primitive time capsules). Even if they did, there were many, many generations of TARDISes following their day (the Doctor's was a Type 40 and considered ancient and obsolete). Certainly later generations of TARDISes were built by people other than Rassilon and Omega as they were gone for thousands of years by the time they were built.
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It's also worth noting that 'The Other' was never mentioned on TV, only in the New Adventures and the novelization of REMEMBRANCE OF THE DALEKS. Given the mostly de-canonised status of the Cartmel Masterplan, the very existence of the Other from the perspective of the TV show is also in question.