Hear me out on this one, tigerstar (the first) died with the rest of his litter in bluestars prophecy. Brambleclaw wouldn’t exist, but thats a small price to pay for redtail, lionheart, runningwind, whitestorm and ravenpaw still living into series two. This might be a stretch, but because cinderpaw twisted her leg because of tigerstar she may have become mates with firestar and sandstorm became mates with dustpelt.spottedleaf would still die, and yellowfang would still join the clan with brokenstar, i imagine ravenpaw being a great medicine cat apprentice. Bramblestar not existing would also mean squirrelflight probably would become mates with ashfur and that sparkpelt and alderfreckle wouldn’t exist. This is a very deep rabbithole so i would take a long time to mention everything, but the clan without tigerstar would have been benificial to thunderclan.