Well remember that version 2 will have the subplot about the fleet being assembled to aid the Resistance, but the Hosnian system is destroyed before it launches. If I ever manage to do a TLJ edit, the Raddus fleet will be retconned into being the remnants of the Republic fleet which has suffered horrible loss in their defense of the galaxy, in an attempt to give the illusion of time passing between the two films:

EPISODE VIII
THE LAST JEDI

The Republic is doomed.
Without the Jedi Knights,
nothing can stand against
the ascendant First Order.

Using secrets delivered
by a sinister informant,
an armada of fearsome
warships commanded by
Supreme Leader Snoke has
ravaged the unsuspecting
New Republic Starfleet
and hunted its survivors
across the stars.

Attempting to escape this
deadly armada, the last of
the tattered fleet has fled
to General Leia Organa
and her Resistance base,
seeking a final spark of
hope amidst the galaxy’s
most desperate hour…