You are still overly worried about the wine being spoiled because of a leaky must bag. Many, many of us have had leaky bags without any problems. Those bags are 2 ply. Must getting between the plies, then outside the second ply is one thing, but anything going back the other way is extremely unlikely.
If the must smelled good and tasted good at the time fermentation started and it smells good and doesn't taste spoiled (rotten) now, it is fine. Like Mike said, if it were bad, it would smell bad.
Have you ever tasted very young wine? It is very tart and usually not at all pleasing to the taste buds. I am saying this so you don't taste it while very young, then throw it out because it doesn't taste like a similar commercial bottle of wine that has been correctly aged.
If the must smelled good and tasted good at the time fermentation started and it smells good and doesn't taste spoiled (rotten) now, it is fine. Like Mike said, if it were bad, it would smell bad.
Have you ever tasted very young wine? It is very tart and usually not at all pleasing to the taste buds. I am saying this so you don't taste it while very young, then throw it out because it doesn't taste like a similar commercial bottle of wine that has been correctly aged.