In business it is a sound practice to expand your premises or equipment to cope with the expansion of business coming your way. The mistake is in buying stuff in the hope that it will generate the business that will pay for it.
Say, you have a truck for hauling sand and you reach a point where your 5tonner can't cope with the demand, there are armies of people out there that will sell you the truck you NEED before breakfast. If you can'i make the payments they all retreat at the sound of your voice.
I think it is the same here with Jason and a TT bike. The difference in the times between a specialized TTer and good road bike over 10 miles will be measured in seconds which will not move your race position from 47th to 1st bot but could move you from 12th to 11th.
And in terms of The Pose - a newcomer on a Venge will provoke a certain amount of derision so beware.