personally i think maybe omen, viper, killjoy, raze and skye/breach
Kj is really really strong, you can single handedly hold down b heaven or b site melting down anyone trying to split b or rush main giving your team easy 10 extra seconds to react. Brim and sova are never played on split meaning that no one can really ult trade the OP round winning killjoy ults. Having killjoy (or cypher in this case) on the team alongside viper allows you to have 1-3-1 setups focusing on different areas of the map
This is an extract of my database where I put all T1 games, the extract show only champions. the right colon is 1 for a victory and 0 for a defeat. The 2 first lign are the first game, the lign 3 and 4 are the 2nd game etc.
As you can see the composition is :
6 7W DRX SPL Raze Vipe Skye Kjoy Omen 1
9 7W LOUD SPL Raze Brea Skye Kjoy Astr 0
20 7W NAVI SPL Raze Jett Skye Cyph Omen 1
23 7W DRX SPL Raze Vipe Skye Kjoy Omen 0
26 7W NRG SPL Raze Vipe Skye Jett Astr 0
28 7W BLG SPL Raze Vipe Skye Cyph Omen 1
37 7W PPR SPL Raze Vipe Skye Jett Astr 1
39 7W KRU SPL Raze Vipe Skye Cham Astr 0
41 7W EDG SPL Raze Vipe Skye Jett Astr 0
44 7W GIA SPL Raze Brea Skye Cyph Omen 1
52 7W TL SPL Raze Vipe Skye Jett Astr 0
54 7W LOUD SPL Raze Brea Skye Kjoy Astr 1
81 7W EDG SPL Raze Vipe Skye Jett Astr 1
83 7W GIA SPL Raze Brea Skye Cyph Omen 0
101 7W EG SPL Raze Vipe Skye Cham Astr 0
104 7W EDG SPL Raze Vipe Skye Jett Astr 1
107 7W FNC SPL Raze Brea Skye Cyph Omen 1
109 7W FUT SPL Jett Vipe Skye Kayo Omen 0
112 7W BLG SPL Raze Vipe Skye Cyph Omen 1
115 7W EDG SPL Raze Vipe Skye Jett Astr 0
118 7W LOUD SPL Raze Brea Skye Kjoy Astr 1
121 7W PPR SPL Raze Vipe Skye Jett Astr 0
129 7W DRX SPL Raze Vipe Skye Kjoy Omen 0
132 7W FNC SPL Raze Brea Skye Cyph Omen 1
145 7W FNC SPL Raze Brea Skye Cyph Omen 0
148 7W LOUD SPL Raze Brea Skye Kjoy Astr 1
154 7W EG SPL Raze Vipe Skye Cham Astr 0
159 7W LOUD SPL Raze Brea Skye Kjoy Astr 1
161 7W PPR SPL Raze Vipe Skye Jett Astr 0
165 7W EG SPL Raze Vipe Skye Jett Astr 1