For Marx this line of thinking wouldn't make sense. Marx was only describing processes that occur in society and to say that the manifesto created these processes would amount to an opposing view of his materialist outlook. For Marx, the Communist movement is a thing that occurs objectively and the ideology itself, the movement's self reflection, is born out of the working class' struggle with capital. Every move by the working class is a moment in the Communist movement because it is the working class that makes communism, not groups of ideologues. Hardly any of the people actually involved with revolutions, every day people who stand up and take class lines, ever read a work of Marx.

The manifesto itself was written just before the revolutions of 1848 and wasn't widely read, with Marx's role, and the party he was in, playing a very minimal role. Marx even disbanded the central committee during it.

In 1864 Marx helped found the International Workingmen's Association but he was still obscure at this point and the IWA had little influence in the next great moment of history during the Paris commune of 1871, with the main and most active revolutionaries being Blanquists, even if Marx himself was gaining more traction in the Communist movement.

When this international collapsed a second one was constituted, called the Second International, and this one was nominally "marxist" in the sense that his ideas became more dominant, and thus is when we get an increase of those who call themselves Marxist, from kautsky to Lenin, pannekoek, Luxembourg, etc. This international, though, collapsed with the start of the first world war and the first world war ended because revolutions broke out in Russia and Germany. But again, even though more "marxists" where involved, it doesn't mean that these revolutions were inspired by the manifesto solely. Many every day Russians never read Marx. Revolutions in these places broke out because capitalism was breaking down and could no longer contain the class struggle that was going on, not because people had read the manifesto.

Please excuse typos as I'm writing on my phone