In each of the battles he awakened a tomoe.Now he's going to be in his most important battle,so i expect him to awaken more tomoes,which will give him more power.Oh yeah, you didn't. I just didn't remember. Been years man :|
Anyways that doesn't mean he earned a tomoe each fight. They actually train you know? Kishi just didn't/doesn't have to show it (besides sasuke and naruto main chuunin exam parts)
Like the 3rd tomoe of the Sharingan allowed him to be able to predict movements.
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Gaining an additional 3 would be cool.