Senghelli are pretty weak as of current events, Civil wart, and all their ships are up at the front, fighting the brutes.
The brutes are in the same situation.
Earth may have insurrection problems, but some of its colonies survived and stayed loyal to the UEG.
The UNSC are only top dog because of the Infinity, the new technological leap against the covenant, and its ability to replenish its losses.
There is a quote in either glasslands or thursday war that says humanity won the war because we are the jack of all trades master of none.
EDIT: saw the civil wart typo, it stays.
Edited by SPECTRE, 19 December 2013 - 12:13 AM.