The odd thing about Tevez and Berbatov is neither were necessarily integral to the teams success
We played better football during the 2006/2007 season than the following 2 seasons and ultimately only came unstuck in Europe due to a little bit of inexperience and injury problems.
Both were clearly world class though.
On the whole, fans do tend to relate a strikers success with that of the wider team. None of the strikers from 98/99 would get in a best United 11 if you had to pick 2 from our history. Sheringham as an example only 5 goals throughout that entire season.