On December 29th Inter Milan will play against Cagliari away, Inter should be able to win the match again because Cagliari is not much different from Como, but even if they win, Inter will not necessarily be able to occupy first place because at the same time Atalanta will compete against Lazio, of course this is not an easy match for Atalanta because Lazio is not a club that can be underestimated, but seeing Inter being able to slaughter Lazio in week 15, I think Atalanta has the opportunity to beat Lazio to stay at the top of the standings, but if they get a draw, Inter and Atalanta's points will be the same.
Yes, it is clear that Inter's match against Cagliari will definitely be won by Inter. Because Cagliari's performance this season can be said to be very bad. Because currently Cagliari is in 18th position in Serie A or more precisely in the relegation zone. So in my personal opinion Cagliari's performance will definitely be worse than Como's performance. Therefore, it should be easier for Inter to get the full 3 points in this match. Apart from that, you are right, if for example in the match against Cagliari Inter can win, this cannot be a guarantee that Inter will be at the top of the standings. Because Atalanta will definitely fight very hard to remain firmly at the top of the standings. In the match against Lazio, I think Atalanta will win the result. Because as we know, Lazio's performance is sometimes unstable and tends to experience a decline in performance in certain matches.
So if, for example, Lazio's performance declines again when facing Atalanta, this will definitely be an advantage for Atalanta. Apart from that, in my personal opinion, even though Lazio can show their best performance in the match against Atalanta, in my opinion Atalanta still has a big chance of winning compared to Lazio. So whatever the conditions, Atalanta is actually still superior compared to facing Lazio. So with this I think Atalanta will remain at the top of the Serie A standings and Inter will probably be in 2nd place for a while.