  We re-examine the recent proposal of Rastelli, Sen and Zwiebach on the
tachyon fluctuation of the vacuum string field theory representing a D25 brane,
originally considered by Hata and Kawano. We show that the tachyon state
satisfies the linearized equations of motion on-shell in the strong sense
thereby allowing us to calculate the ratio of energy density to the tension of
the D-brane to be $E_c/T_{25}\simeq \pi^2/3[1/16(ln2)^3]\simeq 0.62$. Our proof
relies on a careful handling of the limits ($n\to\infty$) involved in the
conformal theory description of the sliver and tachyon states. We conjecture
that the sliver state represents a single D25 brane.
