normal wins give 175 LP in leagues with 8 guilds (leagues with 7 guilds would only give 150)
6 * 175 = 1050 LP
and if a guild starts with 0 LP they get +50% on their first LP
so no problem to start in bronze and end with 1000 LP in the final ranking
I will go through the calculations we made as a guild when we started, but I am sure we ended up doing two gold, maybe it is just one in platinum then.
edit - you end up in lower dime if you win those 5 seasons, so max lps for starting season 6 is 963. Didn’t keep track of it then. But if you then also win your 6th season, in lower dime, you end up with 6 wins and, as you say, 1000 lps. At that point, does it reset for the wins? Either way, it has to be fixed, otherwise you could have someone coming in from say lower Gold, clocking 4 wins, or silver, clocking 5 wins mid Championship and having 1000 lp starting the 6th season, and hence winning the Championship.